"Google" for Source Code (a.k.a. Krugle)

Sorry, but I chose to use the term Google as a verb here, because Krugle has no affiliation with Google. It looks quite promising …

“Krugle makes it easy for developers to find source code and technical information – fast!”

Their beta has had a few issues with balancing a slick UI with many different browsers and browser versions, but you should check it out nonetheless.

Visit the Krugle site and maybe even check out their blog.