diff --git a/asset_hat.gemspec b/asset_hat.gemspec
index d138779..dce9d36 100644
--- a/asset_hat.gemspec
+++ b/asset_hat.gemspec
@@ -113,6 +113,7 @@ Gem::Specification.new do |s|
       s.add_development_dependency(%q<shoulda>, ["~> 2.10.2"])
       s.add_runtime_dependency(%q<cssmin>, ["~> 1.0.2"])
       s.add_runtime_dependency(%q<jsmin>, ["~> 1.0.1"])
+      s.add_runtime_dependency(%q<yui-compressor>, ["~> 0.9.6"])
     else
       s.add_dependency(%q<flexmock>, ["~> 0.8.6"])
       s.add_dependency(%q<hanna>, ["~> 0.1.12"])
@@ -120,6 +121,7 @@ Gem::Specification.new do |s|
       s.add_dependency(%q<shoulda>, ["~> 2.10.2"])
       s.add_dependency(%q<cssmin>, ["~> 1.0.2"])
       s.add_dependency(%q<jsmin>, ["~> 1.0.1"])
+      s.add_dependency(%q<yui-compressor>, ["~> 0.9.6"])
     end
   else
     s.add_dependency(%q<flexmock>, ["~> 0.8.6"])
@@ -128,6 +130,7 @@ Gem::Specification.new do |s|
     s.add_dependency(%q<shoulda>, ["~> 2.10.2"])
     s.add_dependency(%q<cssmin>, ["~> 1.0.2"])
     s.add_dependency(%q<jsmin>, ["~> 1.0.1"])
+    s.add_dependency(%q<yui-compressor>, ["~> 0.9.6"])
   end
 end
 
diff --git a/lib/asset_hat/css.rb b/lib/asset_hat/css.rb
index b68e74e..b2911b1 100644
--- a/lib/asset_hat/css.rb
+++ b/lib/asset_hat/css.rb
@@ -1,11 +1,12 @@
 require 'cssmin'
+require 'yui/compressor'
 
 module AssetHat
   # Methods for minifying and optimizing CSS.
   module CSS
     # A list of supported minification
     # <a href=CSS/Engines.html>engine</a> names.
-    ENGINES = [:weak, :cssmin]
+    ENGINES = [:weak, :cssmin, :yui]
 
     # Returns the expected path for the minified version of a CSS asset:
     #
@@ -121,6 +122,17 @@ def self.cssmin(input_string)
 
         output
       end
+
+      # Ruby-YUI Compressor provides a Ruby interface to the YUI Compressor
+      # Java library for minifying JavaScript and CSS assets.
+      #
+      # Sources:
+      # - http://github.com/sstephenson/ruby-yui-compressor/
+      # - http://rubygems.org/gems/yui-compressor
+      def self.yui(input_string)
+        compressor = YUI::CssCompressor.new
+        compressor.compress(input_string)
+      end
     end
 
 
diff --git a/lib/asset_hat/js.rb b/lib/asset_hat/js.rb
index c308245..f6e15a8 100644
--- a/lib/asset_hat/js.rb
+++ b/lib/asset_hat/js.rb
@@ -1,4 +1,5 @@
 require 'jsmin'
+require 'yui/compressor'
 require File.join(File.dirname(__FILE__), 'js', 'vendors')
 
 module AssetHat
@@ -6,7 +7,7 @@ module AssetHat
   module JS
     # A list of supported minification
     # <a href=JS/Engines.html>engine</a> names.
-    ENGINES = [:weak, :jsmin]
+    ENGINES = [:weak, :jsmin, :yui]
 
     # A list of supported
     # <a href=JS/Vendors.html>3rd-party JavaScript plugin/vendor</a> names.
@@ -79,6 +80,18 @@ def self.weak(input_string)
       def self.jsmin(input_string)
         JSMin.minify(input_string + "\n")
       end
+
+      # Ruby-YUI Compressor provides a Ruby interface to the YUI Compressor
+      # Java library for minifying JavaScript and CSS assets.
+      #
+      # Sources:
+      # - http://github.com/sstephenson/ruby-yui-compressor/
+      # - http://rubygems.org/gems/yui-compressor
+      def self.yui(input_string)
+        compressor = YUI::JavaScriptCompressor.new(:munge => true)
+        compressor.compress(input_string)
+      end
+
     end # module Engines
 
   end