Great bands still kicking it today:
Clutch
Incubus (looking forward to their new album)
Ben Folds- Not guitar music, but this guy still rocks.
Scissor Fight- Completely demented New Hampshire Wood Chuck hard core music. I think Planet of A$$ is their definative song.
Les Claypool's Fearless Flying Frog Brigade- 'nuff said
Stone Temple Pilots
I'll think of other stuff at a later time.