Nowadays, the very little time I have for personal projects is spent doing things like fixing little things and adding little features to BartleBlog  and thinking how I could use GLE and mako templates to create a cool nerdy tool to create charts.
However, I will be having a little time for personal projects in a couple of weeks, and having stumbled onto chipmunk today really got me thinking.
It's a seriously nifty 2D physics library. Consider this demo video:
Now, what could possibly be done with it... I need to really think.