Mad Men - awesome show, but watch it from the start or you'll be a bit clueless. Its about advertising executives in the 1960's and the culture that goes with it. Essential watching IMO. Brilliant quotes such as 'Shall we drink before the meeting, or after? Or
both?' ;D
Futurama - great animation & a bit deeper than your usual laugh-a-minute cartoon, with a running emotional storyline that goes right up until the end of the series.
Supernatual - two brothers in a '67 Impala with a trunk-full of guns, who go around the country womanising and fighting demons/ghosts/spirits. What more can you ask for in a TV show?
Is There Life On Mars? - Good for a bit of a nostalgic trip-out, was a good show while it lasted. I've heard the British version is better, but the recent American one seems pretty good to me. Only one series of it, but definitely worth watching.
I also watch Mythbusters, Top Gear, House, Cold Case and Criminal Minds. Not much else on my list, and I only really watch them when they're showing on TV - none of this stockpiling on DVD stuff so I can watch later... I barely have enough time to watch TV now!
Keep 'em coming - boingk