Here are a few quite useful links for RPG players and potential RPG players:

http://www.systemreferencedocuments.org/35/sovelior_sage/home.html - An online system refrence document for D&D 3.5

http://www.systemreferencedocuments.org/modern/smack/srdhome.html - An online system refrence document for d20 Modern

http://home.redblade.org/ - Home of the redblade D&D character generator, a staple in most of our RPGs.

http://www.pathguy.com/d20modern.htm - A useful, web based tool for constructing d20 modern characters.

If anyone has any suggestions for this list, post 'em here.