Google launches search service for computer code -
http://google.com/codesearch

Google Code Search, a site that simplifies how software developers search
for programming code to improve existing software or create new programs.
Google Code Search helps you find function definitions and sample code by
giving you one place to search publicly accessible source code hosted on the
Internet. With Google Code Search, you can:

* Use regular expressions to search more precisely
* Restrict your search by language, license or filename
* View the source file with links back to the entire package and the
webpage where it came from