Well, the season is not quite over, but found this page on NBA.com, so thought I would start this thread early.
WHich one is your favorite? Al Thorton got on the list (while he was a Wizard), but I like the nick name, Thor's Hammer:

http://www.nba.com/dunkladder/?ls=iref:nbahpt1

I've got to go with the person that first made me start back watching sportcenter for dunks, Blake Griffin. Everybody else came on later, but when he threw it down on dude from the Knicks on the baseline that set mark really high.