I forgot to mention the late Taiwanese director Edward Yang, who died last year. His movie Yi Yi has become one of my all-time favorites, one that I've watched several times and appreciated more each time (a rarity for me). I doubt that he makes it onto anyone's list of favorite directors, but I always admired his stuff.
Bergman, Coen Bros., Hitchcock, Truffaut, Kurosawa, are favorites too. I've really appreciated every movie I can remember seeing by Krzysztof Kieslowski and Zhang Yimou (great call, Petey!). Also have to confess that I really admired Jim Jarmusch, although I don't think of him now as one of my favorite directors.
Kinda gotta hand it to: Scorsese, Coppola, John Ford, John Huston. Whatever.
I'm most conflicted about: Ang Lee, Gus Van Sant. Both have done movies I've loved and admired, and movies that I have thought were garbage. They don't seem to bring it consistently, however.
I'm dismayed/embarrassed that I like: Woody Allen, Mel Brooks, Jacques Tati, John Waters.
Directors I can't stand: Clint Eastwood, James Cameron, M. Night Shyamalan (I didn't even like The Sixth Sense).