TorilMUD: The Sojourner's Home
Simply put, Toril is the best MUD I have ever played and has kept me coming back for more for 10 years. The world is huge and content is always being added. Players are friendly and helpful as is the staff. You'll never run out of things to do on Toril.
I'd invite you to roll up a new character on Saturday September 23, 2006 and listen in on the carnage that is Tiamat. Death OOC will be up and running so you can watch as lvl 50 characters throw themselves against the game's most difficult zone and come out looking like they tangled with a meat grinder!
Roll up and check it out for yourself! www.torilmud.org