Jason Blake gotta be mentionned here. He is the most dominant skater I have ever seen, except maybe Koltsov. Just watch an islanders game and you'll notice every time he is on the ice because of how fast he is skating.
In a game situation where players have to skate for short bursts, my favorite skater is Marian Gaborik, whom is so quick and agile.
Jason Chimera for my money, though, is the fastest guy in the league coming down the wing. In terms of top speed, Chimera. In terms of overall quickness that is useful at the NHL level rather than speed skating competitions, Marian Gaborik.