Source Code Search Engines

http://koders.com/
http://www.allthecode.com/
http://www.google.com/codesearch
http://www.codecodex.com/wiki/index.php?title=Main_Page
http://labs.oreilly.com/code/
http://www.bigbold.com/snippets/
http://www.krugle.com/

The Java Developers Almanac 1.4
http://www.exampledepot.com/egs/index.html

The code project
http://www.codeproject.com/