Thardferr: Fantasy role-playing games (AD&D), strategy game, and very active forums that include roleplaying and general discussion. One of my favorite sites :)
Wizard of The Coast: Probably the coolest company I know. Maker of D&D, loads of other RPGs, Magic Cards, Tons of other TCGs, and probably just about every other fantasy game you can think of.
Cantr II: Fantasy role playing, kind of slow, but realatively easy to figure out and has some friendly people on it.
Muted Faith: An amusing site, has a lot of good humor, including away messages, quizzes, personality tests, and jokes in general. Also has some nice artwork.