Processing Hack Week

Processing is a visualization tool that's Java-based and it looks friggin' awesome: http://processing.org/

There are some bugs to fix, features to add (mainly in the command-line & build department), etc.

There are also text editor modes (vim-related stuff will be up soon-ish, and there used to be a TextMate mode) and derivative projects such as Processing.js and Ruby-Processing that need some work.

Hey, if you can't code, you could just learn Processing and make something cool :D