The Google Summer of Code project ideas and organizations list is up: http://code.google.com/soc/2008/
One of the organizations is LispNYC whose project ideas are listed here: http://lispnyc.org/soc2008.clp
Contact them if you want to mentor or if you'd like to join one of their projects. There are a few interesting projects listed like writing an extension to Firefox that allows you to use Common Lisp instead of JavaScript, and writing an interpreter or compiler for Javascript to be integrated with the Closure web browser.
-Rudolf