third link
http://www.bedfordstmartins.com/litlinks/critical/
A list of authors that if you click on one will take you to links where you can read about them, join a discussion group online (or just read their discussion - my favorite), read their work online, or other.

second link
http://theory.eserver.org/dir/Cultural_Studies
Has sources for many disciplines, critical studies, critical legal studies, cultural studies, and others