Fast Boy Cycles makes some incredible bicycles. I had never really seen a full blown mountain bike from Ezra Caldwell (sweet last name) who makes all of the creations. Culture Cycles has some great photos up on their site of one of his new bikes called the Ultimate Tight Ass. Not sure who came up with the name for this beast, but it definitely looks like it would haul ass down the trail.
Update: Appears Cycle Exif also has more information and photos on the UTA.