Well, it's an old one for me . . . www.WoTMUD.org. It's a multi-user dungeon, which for the uninitiated, is a text-based role-playing game online. This one is actaully sanctioned by Robert Jordan, and I can honestly say, if you dig WoT and RPGs, this will knock your socks off. It's fun, pretty accurate re: the world of WoT (they just open the Isle of Madmen), and there is action for both player-killers and role-players.
There's been some trouble with the recently moved server of late, but you should check it out if you get the chance. Try looking up Liudmilla or Arsinoe if you need assistance, though I haven't been on much recently.