No particular order, but some drummers that have impressed me:
Flo Mounier from Cryptopsy. He's incredibly fast with the double bass of course, but manages to actually do stuff at the same time. Crazy tempo changes and all that. (This impression is just based on None So Vile, the only Cryptopsy album I have, but it's awesome.)
Bill Ward from Black Sabbath. His fills are very creative, and all of his beats are non-generic and interesting. Part of what makes Black Sabbath worth listening to.
Martin Lopez, of course. No need to explain.
Ginger Baker from Cream. Listen to that cool solo in "Toad." I love drum solos.
Barriemore Barlowe of Jethro Tull. Simply a great drummer. Plenty of cool solos, and just good all around.