Doctor Who, Top Gear are the two at the moment.
I also really enjoy House, Lie to Me and Burn Notice. I fell off watching them though, I also enjoyed Fringe and the one show on USA about a doctor in the Hamptons. But I fell off watching those even more so. I catch Doctor Who and Top Gear on Netflix.
Top Gear. Always has been, always will be.
Also a bit of a svcker for Heroes (only seen season one though and a bit of two)
Here in the UK, Mock the Week and Have I Got News For You are always great (unless on HIGNFY the host is the most unfunny and serious guy ever)
Apart from that, I don't watch TV. Too busy gaming (or working)
Who's your favorite host off the show? I think mine would have to be Richard, and I never knew that show as as funny as it is. But man I was crying at certain parts.
Anyways after reading through the thread I remembered other shows that I used to watch and liked very much, those being Heroes, Spartacus and Weeds. I might finish watching Weeds some day but it'll be after I catch up on Doctor Who.