RPOL.net : A site dedicated to hosting online roleplaying games. Includes my games: Crown of the Shadowmage and Secrets of Birgin'zia
Star-Fleet.com: Online Star Trek roleplaying.
Merp.com. For all those MERP enthusiasts; contains an archive of all old MERP books.
The ICE homepage. Creators of the Rolemaster system.
This site, trek-rpg.net, was orignally set up to cater for the LUG Star Trek RPG, and has since then changed to accomodate Decipher's Trek, as well as their LOTR.
WebRPG.com, for ALL your roleplaying needs!