24 is simply the most addictive programme I have ever seen.
The Sopranos is also something I am getting into.
The Office was also amazing. I recall watching it's original run on BBC2, a whole year before the rest of the country seemed to notice it. BBC2 repeated the series after a year. Suddenly, Ricky Gervais hysteria exploded and everyone was calling it genius. I already knew what the fuss was about. So I've been a fan from day one.
Spaced was also an excellent programme, one of my favourites.