TCRF is a wiki dedicated to cateloguing unused and cut content from video games, such as debug menus, unused music, graphics, enemies, levels, and more. For example, check out its great section on Chrono Trigger. It could sure use your help to expand! Head on over and check it out!
If you have any questions about editing or want to see the latest discoveries in unused/hidden content, check out their forum at Jul or their IRC channel at irc.badnik.net #x.