diff --git a/.gitignore b/.gitignore
index 82ba1ba..5f62e89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,9 @@ docs/_build/
 
 # Autoenv
 .env
+
+# GAE
+google
+google/
+google_appengine/
+google_appengine_*.zip
diff --git a/.travis.yml b/.travis.yml
index fbbe4a5..d6b9da8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,8 +10,8 @@ install:
 
 # environment dependencies
 before_script:
-  - curl -O https://storage.googleapis.com/appengine-sdks/featured/google_appengine_1.9.23.zip
-  - unzip -q google_appengine_1.9.23.zip
+  - curl -O https://storage.googleapis.com/appengine-sdks/featured/google_appengine_1.9.27.zip
+  - unzip -q google_appengine_1.9.27.zip
   - ln -s google_appengine/google google
 
 # command to run tests
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7294593..ed407b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+0.2.0
+====
+- Added the `environ` module.
+
+
 0.1.2
 =====
 - Actually fix the MANIFEST.in contents.
diff --git a/README.md b/README.md
index a7ada69..05f55b1 100644
--- a/README.md
+++ b/README.md
@@ -1,17 +1,13 @@
 GAEK: Google App Engine Kit
 ===============================
 
-.. image:: https://img.shields.io/travis/erichiggins/gaek.svg
-        :target: https://travis-ci.org/erichiggins/gaek
-
-.. image:: https://img.shields.io/pypi/v/gaek.svg
-        :target: https://pypi.python.org/pypi/gaek
+[![Build Status](https://travis-ci.org/erichiggins/gaek.svg)](https://travis-ci.org/erichiggins/gaek)
 
 
 A collection of useful tools for Python apps running on Google App Engine.
 
 * Free software: BSD license
-* Documentation: https://gaek.readthedocs.org.
+* Documentation: http://erichiggins.github.io/gaek/
 
 NDB JSON module
 ---------------
@@ -29,8 +25,40 @@ Usage:
 
 Feature parity with the Python `json` module functions.
 
-`ndb_json.dumps`
+* `ndb_json.dumps`
+* `ndb_json.dump`
+* `ndb_json.loads`
+
+
+Environment module
+------------------
+
+* `environ.get_dot_target_name(version=None, module=None)`
+
+   Returns the current version/module in `-dot-` notation which is used by `target:` parameters.
+
+* `environ.get_environ_dict()`
+
+   Return a dictionary of all environment keys/values.
+
+* `environ.is_host_google()`
+
+   True if the app is being hosted from Google App Engine servers.
+
+* `environ.is_development()`
+
+   True if the dev_appserver is running (localhost or local development server).
+
+* `environ.is_staging(version=None)`
+
+   True if the app is hosted by Google (appspot.com) but the version is not the default.
+
+* `environ.is_production(version=None)`
+
+   True if the app is being hosted by Google and the default version.
+
+* `environ.is_default_version(version=None)`
+
+   True if the current or specified app version is the default.
 
-`ndb_json.dump`
 
-`ndb_json.loads`
diff --git a/VERSION b/VERSION
index d917d3e..0ea3a94 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.1.2
+0.2.0
diff --git a/gaek/__init__.py b/gaek/__init__.py
index 7c9cc1a..9f343ab 100755
--- a/gaek/__init__.py
+++ b/gaek/__init__.py
@@ -2,4 +2,4 @@
 
 __author__ = 'Eric Higgins'
 __email__ = 'erichiggins@gmail.com'
-__version__ = '0.1.2'
+__version__ = '0.2.0'
diff --git a/gaek/environ.py b/gaek/environ.py
new file mode 100644
index 0000000..1f04e0a
--- /dev/null
+++ b/gaek/environ.py
@@ -0,0 +1,181 @@
+# -*- coding: utf-8 -*-
+"""
+Environment discovery and helper functions for Google App Engine.
+Some methods from the following modules have been made available for convenience:
+
+* [`google.appengine.api.app_identity`](https://cloud.google.com/appengine/docs/python/appidentity/)
+* [`google.appengine.api.modules`](https://cloud.google.com/appengine/docs/python/modules/)
+* [`google.appengine.api.namespace_manager`](https://cloud.google.com/appengine/docs/python/multitenancy/)
+
+Example:
+
+  import environ
+
+  # Only send emails in production.
+  if environ.is_production():
+    mail.send(*args, **kwargs)
+  
+"""
+ 
+__author__ = 'Eric Higgins'
+__copyright__ = 'Copyright 2015, Eric Higgins'
+__version__ = '0.0.1'
+__email__ = 'erichiggins@gmail.com'
+
+
+import os
+
+from google.appengine.api import app_identity
+from google.appengine.api import modules
+from google.appengine.api import namespace_manager
+
+
+__all__ = (
+    # App Identity functions.
+    'get_application_id',
+    'get_default_version_hostname',
+    'get_service_account_name',
+    # Module functions.
+    'get_current_instance_id',
+    'get_current_module_name',
+    'get_current_version_name',
+    'get_default_version',
+    'get_hostname',
+    'get_modules',
+    'get_versions',
+    # Namespace functions.
+    'get_namespace',
+    'google_apps_namespace',
+    # Helper functions.
+    'get_dot_target_name',
+    'get_environ_dict',
+    'is_host_google',
+    'is_development',
+    'is_staging',
+    'is_production',
+    'is_default_version',
+)
+
+
+_UNDEFINED = '_UNDEFINED_'
+
+
+# App Identity functions.
+get_application_id = app_identity.get_application_id
+get_default_version_hostname = app_identity.get_default_version_hostname
+get_service_account_name = app_identity.get_service_account_name
+
+
+# Module functions.
+get_current_instance_id = modules.get_current_instance_id
+get_current_module_name = modules.get_current_module_name
+get_current_version_name = modules.get_current_version_name
+get_default_version = modules.get_default_version
+get_hostname = modules.get_hostname
+get_modules = modules.get_modules
+get_versions = modules.get_versions
+
+
+# Namespace functions.
+get_namespace = namespace_manager.get_namespace
+google_apps_namespace = namespace_manager.google_apps_namespace
+
+
+# Helper functions.
+
+
+def is_host_google():
+  """True if the app is being hosted from Google App Engine servers."""
+  return os.environ.get('SERVER_SOFTWARE', '').startswith('Google') or get_hostname().endswith('.appspot.com')
+
+
+def is_default_version(version=None):
+  """True if the current or specified app version is the default."""
+  version = version or get_current_version_name()
+  return get_current_version_name() == get_default_version()
+
+
+def is_development():
+  """True if the dev_appserver is running (localhost or local development server)."""
+  return os.environ.get('SERVER_SOFTWARE', '').startswith('Development')
+
+
+def is_staging(version=None):
+  """True if the app is hosted by Google (appspot.com) but the version is not the default."""
+  return is_host_google() and not is_default_version(version)
+
+
+def is_production(version=None):
+  """True if the app is being hosted by Google and the default version."""
+  return is_host_google() and is_default_version(version)
+
+
+def get_dot_target_name(version=None, module=None):
+  """Returns the current version/module in -dot- notation which is used by `target:` parameters."""
+  version = version or get_current_version_name()
+  module = module or get_current_module_name()
+  return '-dot-'.join((version, module))
+
+
+def _get_os_environ_dict(keys):
+  """Return a dictionary of key/values from os.environ."""
+  return {k: os.environ.get(k, _UNDEFINED) for k in keys}
+
+
+def _get_app_identity_dict(keys):
+  """Return a dictionary of key/values from the app_identity module functions."""
+  return {k: getattr(app_identity, k)() for k in keys}
+
+
+def _get_modules_dict(keys):
+  """Return a dictionary of key/values from the modules module functions."""
+  return {k: getattr(modules, k)() for k in keys}
+
+
+def _get_namespace_manager_dict(keys):
+  """Return a dictionary of key/values from the namespace_manager module functions."""
+  return {k: getattr(namespace_manager, k)() for k in keys}
+
+
+def get_environ_dict():
+  """Return a dictionary of all environment keys/values."""
+  return {
+      'os.environ': _get_os_environ_dict((
+          'AUTH_DOMAIN',
+          'CURRENT_CONFIGURATION_VERSION',
+          'CURRENT_MODULE_ID',
+          'CURRENT_VERSION_ID',
+          'DEFAULT_VERSION_HOSTNAME',
+          'FEDERATED_IDENTITY',
+          'FEDERATED_PROVIDER',
+          'GAE_LOCAL_VM_RUNTIME',
+          'HTTP_HOST',
+          'HTTP_PROXY',
+          'HTTP_X_APPENGINE_HTTPS',
+          'HTTP_X_APPENGINE_QUEUENAME',
+          'HTTP_X_ORIGINAL_HOST',
+          'HTTP_X_ORIGINAL_SCHEME',
+          'SERVER_NAME',
+          'SERVER_PORT',
+          'SERVER_SOFTWARE',
+          'USER_IS_ADMIN',
+      )),
+      'app_identity': _get_app_identity_dict((
+          'get_service_account_name',
+          'get_application_id',
+          'get_default_version_hostname',
+      )),
+      'modules': _get_modules_dict((
+          'get_current_module_name',
+          'get_current_version_name',
+          'get_current_instance_id',
+          'get_modules',
+          'get_versions',
+          'get_default_version',
+          'get_hostname',
+      )),
+      'namespace_manager': _get_namespace_manager_dict((
+          'get_namespace',
+          'google_apps_namespace',
+      )),
+  }
diff --git a/tests/test_environ.py b/tests/test_environ.py
new file mode 100755
index 0000000..968bc70
--- /dev/null
+++ b/tests/test_environ.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+test_environ
+----------------------------------
+
+Tests for `environ` module.
+"""
+
+import os
+import unittest
+
+from google.appengine.api import app_identity
+from google.appengine.api import modules
+from google.appengine.api import namespace_manager
+from google.appengine.ext import testbed
+
+from gaek import environ
+
+
+class TestEnviron(unittest.TestCase):
+
+    def setUp(self):
+        # Setups app engine test bed.
+        # http://code.google.com/appengine/docs/python/tools/localunittesting.html
+        self.testbed = testbed.Testbed()
+        self.testbed.activate()
+        # Declare which service stubs you want to use.
+        self.testbed.init_app_identity_stub()
+        self.testbed.init_modules_stub()
+
+    def tearDown(self):
+        self.testbed.deactivate()
+
+    def test_app_identity_functions(self):
+        assert app_identity.get_application_id == environ.get_application_id
+        assert app_identity.get_default_version_hostname == environ.get_default_version_hostname
+        assert app_identity.get_service_account_name == environ.get_service_account_name
+
+    def test_modules_functions(self):
+        assert modules.get_current_instance_id == environ.get_current_instance_id
+        assert modules.get_current_module_name == environ.get_current_module_name
+        assert modules.get_current_version_name == environ.get_current_version_name
+        assert modules.get_default_version == environ.get_default_version
+        assert modules.get_hostname == environ.get_hostname
+        assert modules.get_modules == environ.get_modules
+        assert modules.get_versions == environ.get_versions
+
+    def test_namespace_functions(self):
+        assert namespace_manager.get_namespace == environ.get_namespace
+        assert namespace_manager.google_apps_namespace == environ.google_apps_namespace
+
+    def test_get_environ_dict(self):
+        # TODO(eric): This one is a bit hefty.
+        pass
+
+    def test_get_dot_target_name(self):
+        val = environ.get_dot_target_name()
+        assert val == 'testbed-version-dot-default', repr(val)
+
+    def test_is_host_google(self):
+        val = environ.is_host_google()
+        assert val == False, repr(val)
+
+    def test_is_development(self):
+        val = environ.is_development()
+        assert val == True, repr(val)
+
+    def test_is_staging(self):
+        val = environ.is_staging()
+        assert val == False, repr(val)
+
+    def test_is_production(self):
+        val = environ.is_production()
+        assert val == False, repr(val)
+
+    def test_is_default_version(self):
+        val = environ.is_default_version()
+        assert val == False, repr(val)
+
+
+if __name__ == '__main__':
+    unittest.main()