simpsons
jackass
seinfeld
the ice-t behind the music

Simpsons (thru season 7)
Seinfeld
MASH
Mary Tyler Moore
WKRP
Taxi
Law & Order
Star Trek (original and TNG)
Cheers
many game shows (Match Game, Family Feud, Card Sharks)

I watch this shows over and over again:

Friends
Fresh Prince of Bel Air
The Wonder Years

I watch this shows over and over again:

Friends
Fresh Prince of Bel Air
The Wonder Years
Cheers

The three TV shows I watch AGAIN and AGAIN:

The Simpsons
The Sopranos
Tenacious D

I have complete collections of all three of these series, and I watch them A LOT, like whenever friends come over, etc. And the third one, Tenacious D, is especially rewatchable, as there are only 6 episodes, so you have to get a lot of mileage out of it! :)

I can't beleive no one has mentioned TWIN PEAKS yet. I notice more things every time I watch that show.

I also love to re-watch My So-Called Life and Star Trek Deep Space 9.

Simpsons
News Radio(although the show wasn't quite the same without Phil)
Homicide
Xena
Buffy
Twilight Zone
Tales from the Darkside

Seinfeld
MacGuyver
Knight Rider

Simpsons
Futurama
Seinfeld

Anyone know when we can look forward to Futurama on a daily syndicated basis?

Buffy, Buffy, Buffy, ...
Star Trek TOS
Friends
Seinfeld
Ned & Stacey
Black Sheep Squadron
Angel, and did I mention Buffy! :)

The Simpsons

I'd have to say, in no particular order ...

Babylon 5
Xena (the first 4 seasons, after that it just got weird)
Star Trek: The Next Generation (deep sleep 9 and lost in space, er, voyager just suck - and not in a good way)
Will and Grace
Some of My Best Friends
Bette
Maude
All in the Family