Just to add to what I said previously about
Doctor Who - cos I've just remembered that Season 3 starts to air on Sci Fi in America on July 6th. So, any Americans out there I urrrrge you to watch! It doesn't matter if you haven't seen anything of the series so far, the format has entailed that it basically reboots itself after each season, re-introducing the main concepts, etc, so new viewers aren't lost.
I think it's quite difficult for foreign types to quite understand DW's impact here in the UK. After the soaps, this is the highest-rated show on telly (it got over 8 million viewers for the finale), makes millions in merchandise (including action figures, kids pants, three separate magazines, a card game, the list goes on...), has TWO spin-off series in production, and wins multiple awards.
Okay, I am a complete geek for this, but if you can, give it a try.
EDIT: Oh, and it was announced only yesterday that Kylie Minogue is going to star in this year's Christmas Special. How marvellous.