There are a few shows I make a point to catch:

The Daily Show With John Stewart - Simply the best show on TV right now.

Real Time With Bill Maher - A surprisingly smart, funny political vehicle.

Curb Your Enthusiasm - Still one of the funniest shows on TV.

Pardon The Interruption - In my mind, the BEST sports talk show.

Chappelle's Show - Rude, crude, and daring, it's like SNL was in the beginning and when Eddie Murphy first joined.

The Late Show With David Letterman - Still makes me laugh after all these years.

Late Night With Conan - who will have the Tonight show in 2009.

Six Feet Under - I believe one of the most underappreciated shows on TV. Much better than the Sopranos is now.

The Simpsons - For so long, it was the gold standard in comedy and now has begun the long ride into the sunset.

Also, If We're Not Just Counting Current Shows:

Firefly
Futurama
Family Guy, until it returns
Monty Python's Flying Circus

Take care all.