Drama
Dexter
United States of Tara
True Blood
Comedy
South Park
Daily Show
The Office
30 Rock
It's Always Sunny in Philadelphia
True Blood is the most recent edition to my schedule. The Office has sort of become a hit or a miss (same with 30 Rock), despite starting out strongly. The most recent episode (which was actually a flashback to funny moments in previous episodes) kept me lolling for the entire time. Dexter, of course, is at the top of my list for a very good reason. If you don't watch it, you're missing out.
Current season finished a few weeks back. Next one starts in September, I believe.