SourceForge.net: cpwiki

http://sourceforge.net/apps/mediawiki/cpwiki/index.php?title=Main_Page

Cpwiki is a website dedicated to answering Frequently Asked Questions (FAQs), common pitfalls, and other issues about C and C++.

Cpwiki uses Wiki software, which means that anyone can edit the information herein, and add their own topics (after registering, of course). The topics ought to be related to C and/or C++. (Other types of pages may be accepted, but they may be deleted as well. It would be advisable to ask before creating them.)