Vitor Belfot vs. Marvin "the Beastman" Eastman from UFC 44 (I think). It features the worst cut that I've ever seen in a fight. It's so awesome that you just may poop yourself.
Also, try watching any of the Ultimate Knockouts DVDs. There are 4 of them (I think), and it should give you a pretty good overview of anything you may have missed. They show them on Spike TV sometimes too.