My favourite channel is a toss-up between E4 and Dave. My favourite program on E4 is either How I Met Your Mother, or The Big Bang Theory. And my favourite show on Dave is all the stand-up, Red Dwarf, Mock the Week, Russel Howard's Good News and QI and QI XL.
Most things on USA and TNT; I'm really into crime/mystery/drama/action shows. Things like Burn Notice, Covert Affairs, NCIS, White Collar, Bones, CSI, Law and Order, etc. I occasionally watch TBS for some humor; the shows I normally watch on that station are My Name is Earl, King of Queens, How I Met Your Mother, Seinfeld, and some others.
I don't have a favourite channel but my favourite show ever is definitely The Wire. I've seen all seasons except the last one now. I've been borrowing the DVDs from my brother and each time he gives me another season to watch it only takes me a few days to watch all episodes. One night I watched six episodes in a row. Other shows that I like include OZ, Prison Break, South Park, etc.
I guess my favorite channel would have to be CBS because it has most of the shows I watch. My favorite show would probably be Big Bang Theory right now. I also watch H.I.M.Y.M. and Dr. Who. Those would come in second and third.
History Channel, Discovery, Animal Planet, Nat Geo, and all their sub channels as well as BBC Knowledge. I generally watch documentaries, hence my no-life status as a nerd.