Svartorm Said Hoglan first, if there is a drummer on this planet better than Neil Peart, it's Gene Hoglan. Richard Christie is awesome too, he used to live about a 20 minute drive from me back in the day, used to see him at concerts etc. once in a while, but he hasn't been back here or even to St. Louis in ages. Someone said Flo Mounier too, another amazingly talented guy, ridiculously fast, and dead on timing.
My favorite besides Gene would probably have to be Gar Samuelsson, who was the original drummer for Megadeth, or Mike Smith from Suffocation. Gar was amazing, really sucks that by the time most people got a chance to hear him he was a full blown junkie and his playing had started to suffer horribly(and of course he died very soon after Megadeth started getting noticed). Mike Smith is just a beast, not only does he play damn well, but he looks mean doing it! Watching him at a live show you almost expect him to pound his kit to dust by the time the set is over. Immolation has always consistently had very good drummers too, and the way they mesh their guitar and drum sounds in the majority of their stuff just sounds incredibly cool.
Also a funny side note for the guy that mentioned Danny Carey from TOOL, who is also crazy good. My Cousin's Ex Husband was a classmate of Danny's while he was a student at the University of Missouri Kansas City school of music, and said even then he was amazing. Supposedly a pretty nice guy too. Small world I guess.