Six Feet Under, having only started watching it from Season 1 when it was repeated on Sky some months ago. It ran in the US from 2001.
We're now well into Season 3 of the show as Sky has run it pretty much non-stop once a week and I'm as hooked on it as I was with The Sopranos and Mad Men. It's top quality TV - a drama about a family who run a funeral parlour. It's funny, it's quirky, it's dark and disturbing. It's wonderful and I can't rate it highly enough.