Lots that have already been mentioned, but here are a few more.
Kids in the hall
Who's line is it (either version, but as a yank, the american one tends to make more sense)
Saturday Night Live has moments of greatness, but too often is pretty bad
The Daily Show until about after a week after the election and now I am so burned out on politics I have not found it interesting.
As a kid I always like the Electric Company and the Bloodhound Gang. I was talking to a lesbian friend of mine a while back and Bloodhound Gang came up. I asked her how much of a crush she had on Pepper and was told " AGGHH, get out of my head!"
Current favs also include The Thirsty Traveler, Cooks Tour, Dwell and Good Eats. I tend to ignore most prime time shows, generally dislike "reality" shows and find most of the spin offs of CSI and L&O to be not nearly as good as the originals.