I really like The Daily Show and The Colbert Report, but the US could use someone like Charlie Brooker. [I presume a prole at the Guardian put "Daily Show" in the subhead for this article, sadly.]
He's a columnist for the Guardian, but I knew him first from his TV. He does tv-fiction (a previous comedy called Nathan Barley about new media peasants like those in Shoreditch Twat, and a reality-show-based zombie horror thriller dramedy called Dead Set.] And he does tv-factual -- His new show about news, Newswipe, is as funny as his TV-in-general show Screenwipe, but feistier.
Newswipe on Youtube [On Youtube each link is only to part 1 of each episode so you'll have to scour youtube for later segments, but it's worth it]:
Newswipe Episode 1
Newswipe Episode 2
Newswipe Episode 3, the most recent episode. --they include a nice look at the looniness of Fox News and especially Glen Beck from a Brit. And a thought-provoking mini-documentary from Adam Curtis about "Oh, Dearism" and how it obfuscates political argument. Episode 3 is the best so far, at least to this Yankee.