README

There are few if any docs for dbus-python that are up-to-date.

Tiny "hello world" tutorial:
http://excid3.com/blog/an-actually-decent-python-dbus-tutorial/

Check the following urls for source code:
http://bazaar.launchpad.net/~rick-rickspencer3/+junk/sound_menu/files
http://bazaar.launchpad.net/~chipaca/ubuntuone-music/trunk/files

Perhap PyGObject/PyGI with gdbus would be better after all, since you 
should be able to use gdbus C docs more directly? 
(e.g. GIO's g_dbus_proxy_new_sync becomes PyGI's Gio.DBusProxy.new_sync)

Some information here:
http://live.gnome.org/PyGObject
http://live.gnome.org/PyGObject/IntrospectionPorting
gdbus:
http://www.piware.de/2011/01/na-zdravi-pygi/

and gdbus in the GIO API reference:
http://developer.gnome.org/gio/2.30/gdbus-lowlevel.html
http://developer.gnome.org/gio/2.30/gdbus-convenience.html