In this post I do not intend to make a list of the best programmers web sites, but to share with you some you might not know:

CodeFetch - Search for source code in programming books. Their mission is to connect programmers with authors and is uses and support open source. If we are talking about code search I am sure you are familiar with Koders - top search engine for code.

FreeTechBooks - Free Online Computer Science and Programming Books, Textbooks, and Lecture Notes.

QuickRef - interactive programming documentation, allows you to keep many docs and remember them.