I'm guessing a lot of people already know about this resource, but if not, I wanted to share what I found today.

Want to let people run some type of custom Google search against only your web site? Want to use Google Maps? Heck, want to publish Google Maps? Incorporate the calendar in your site, or new widgets for the iGoogle homepage for your web site?

http://code.google.com/

On the same topic, a group called Kurgle recently launched a code search engine
http://krugle.com/