I wonder what took so long for Google to enter this market when others had already shown some potential. Behold Google Code Search. Actually, it does not look much different than our everyday search, but lists help for using regular expressions.
In a true Google style, the homepage is very focused, with an option for Advanced Search. And the implementation language can be specified as part of the query, so much more convenient. I am going to try and look for popular weaknesses that applications might carry (UPDATE: uhoh, already done). On the thought of regular expressions, can I search for specific regular expressions! Lot of googling to do!!!

