Let's get the usual suspects out of the way : Avatar: The Last Airbender Lost The Wire Gargoyles Star Trek the Next Generation Battlestar Galactica Batman/ Superman/ Justice League Cowboy Bebop Add more (or argue why/ why not).
Mad Men +1 on The Wire (the only TV show that ever made me cry like a baby) The Sopranos Max Headroom (very short lived, but incredibly influential) The Singing Detective Rockford Files That's just off the top of my head...
I am slowly downloading that Better Off Ted show. So far, pretty clever, and it does make me laugh. Ted is not so hard on the eyes either. Ahhhh... And +1 for TNG. Patrick Stewart. Ahhhh...
Current shows: Breaking Bad Sons of Anarchy Rescue Me The Riches Burn Notice older shows no longer on air with new episodes (canceled or series ended): Buffy the Vampire Slayer Angel Veronica Mars American Gothic (IMHO one of the best canceled-to-soon shows of all time) The X-Files (except for those last couple of seasons) The Sopranos The Wire OZ Deadwood Carnivàle Six Feet Under Twin Peaks (the first season only. Seriously, that was an epic, if strange, mystery show)