The Big Bang Theory is tipped to be the next top American sitcom. It's a series about two science geeks who move in together and find themselves living next to a sexy female neighbour. As you can see, it has a similar premise to The IT Crowd (i.e. both about geeks) - I don't think both shows can survive over there.
Apparently The Big Bang Theory was subject to "a number of bids" from British broadcasters at the LA Screenings. After some heavy bidding, Channel 4 won the rights; they'll be showing it here next year.
The trailer is on this page:
http://www.cbs.com/primetime/fall_preview_2007/
(click the Monday 8:30 slot)
I have to say, as far as American sitcoms go, it does look quite fun (maybe that's because I'm a bit of a geek myself?). The character Simon Helberg plays (the guy in the red) made me laugh.