I love 24. There are not a whole lot of other shows that are currently on television that I really like. Like most people, I enjoy Family Guy. I do watch The Office, but it is terrible compared to the original UK Office.
I guess the one show currently on that I watch regularly is Rescue Me. It is actually a pretty decent show. Another modern show that can be either really funny or really awkward is It's Always Sunny In Philadelphia.
As far as older shows, I loved Arrested Development. I cannot for the movie to come out, if it ever gets going. I loved The Office as well. Those guys did a great job with Extras as well. Great team.
Also Fawlty Towers. Basil Fawlty is one of my favourite television characters of all time. Just look at my avatar.
If not for having Tivo and Netflix, I would probably miss most or all of these shows.