Google code search launched

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

Source: Google

Try it out:
http://www.google.com/codesearch