Google Search

Google helps programmers find code online.
Google has created a specialized search engine designed to find software source code publicly available on the Web. The code search engine, which debuted on Thursday, October 5, is intended to help professional programmers, hobbyist developers, and code enthusiasts with the difficult task of finding source code online.
Google's code search engine: http://www.google.com/codesearch
Source: http://www.infoworld.com/article/06/10/05/HNgooglecodeonline _1.html