Bounties

Take a look at these bounties, Google is definitely throwing a lot of money into it:

http://www.gnome.org/bounties/Google.html

The KDE ones seem to have more specific rules, and even if you don't code KDE, there are bounties for "visionary developers"!

http://developer.kde.org/joining/googlesummerofcode.html

Please comment on the projects, not necessarily what you are willing to do, but what interests you and what you think are the most workable.