Hallo!
As also IOhannes said, that he would be a mentor for the GEM projects, I started now to make a WIKI, where the projects we discussed are discribed.
This page must be presented to google (description of puredata and of the single projects) - so maybe some english native speaker can correct my really bad english and make this text looking better to the google guys (everyone with an puredata.org account should have write privilegs).
Here is the WIKI: http://puredata.info/dev/summer-of-code
LG Georg