I'm sorry I have not really tested this, but this was too cool not to pass on. A source code search engine. It may-or-may-not contain cool stuff, but I'm sure it's worth the effort to find out. I was just praising the breadth and depth of SourceForge as a resource for the hapless programmer, while bemoaning it's lack of organization ("I need a compression algorithm..."). Koders may answer that.
It's similar-but-different than the code library index I've been slowly building from the C/C++ Users Journal.