Have a look at my git repository to see some of the things I've been working on just for fun:
Note that the code is largely undocumented, and most probably won't even work.
The description for some of the folders there may or may not be here on wiki:
Bird, a simple, extendable Python client for Twitter.
Chukchi, a web-based RSS aggregator app.
godviller, a twitter/godville bot.
jmail, an email-based XMPP logger.
Some things I've started, but did not complete for various reasons:
These things are largely outdated and listed here for historic purposes:
Euterpe, a music synchronization framework (copies your music to your music player recoding it if necessary).
There is also a CookBook with some code snippets and whatnot.
If you want to contact me, use the following e-mail: firstname.lastname@example.org