LiveApi.org is so cool, it's a couple guys who figured out how to hack into the Ableton Live API through some system calls, so now you can write Python programs and hook into Ableton Live.
I'm a huge fan of Ableton Live, I've never really found a music producing system that felt right, and Ableton Live feels right. The only problem is that it isn't GPLed. Other than that, it's the best DJ and music production system out there.
