1. The Nameless One vs. The Transcendent One in Planescape: Torment, mostly for the incredible dialogue and the fact that selecting the text choices to avoid the battle actually gives you the cooler ending(s) IMO.
2. Darth Malak in KoTOR
3. Ganon in OoT (after the tower collapses)...I also really like the Phantom Ganondorf battle in the Forest Temple of that game.
Golbez from ff4
tavion/marka ragnos & tavion/kyle (depending on side) in jedi academy (awesome long battles)
also bowser in any mario game ^^
Originally Posted by Maxx Power
So far playing WoW, I've shouted "ROFLCOPTER" on no less than fifteen occasions, danced as a bear at the end of a ship, and compared the Klu Klux Klan to cereal.