Python-dbushelper is a project mainly written in Python, it's free.
A useful API which lets you easily access dbus methods
Just a simple Python module by which you can access dbus methods without making troubles with the dbus related stuff.
I've mainly started coding this module because I think it could be used as a simple interface for a rapid access to NeoPhysis libs which provide some methods via dbus. It uses dbus Introspection to get dbus' methods details.