Yesterday, as part of Ubuntu Opportunistic Developer Week, I did an IRC talk about writing a (basic) Rhythmbox plugin in Python.
You can see the talk, the slides, and the plugin at http://www.kryogenix.org/code/RBMicroBlog/.
Writing a Rhythmbox plugin
I'm currently available for hire, to help you plan, architect, and build new systems, and for technical writing
and articles. You can take a look at some projects I've worked on and
some of my writing. If you'd like to talk about your upcoming project,
do get in touch.