Python-enabled RSS Readers
Python-enabled RSS readers and parsers appear to be in abundant supply. Some include useful source code. These days, you *rarely* need to reinvent the wheel.
Peerkat:
EffNews RSS Reader:
Mark Pilgrim's RSS Parser:
Usage exampes:
Pears (uses wxPython for its GUI):
If you need something for Linux with Gnome, check Straw:
http://www.nongnu.org/straw/
In fact, for Python, just go to the Vaults of Parnassus (http://www.vex.net/~x/parnassus/) and use the search box ("RSS," "RDF," "aggregator," etc.).
Then, of course, there is the ubiquitous:
You can easily find free source code for C#, Java, and other languages, as well.