I promised Rakshi a Clive Owen spam, since she didn't think she was familiar with him, when I mentioned him as another reason to see Sin City (in addition to Elijah's appearance as... well, a very creepy and cool character *G*).
So... why should you already know about him? He made a splash in "The Croupier"; played a great role in "Gosford Park"; was one of the assassins in "The Bourne Identity"; and was nominated for an Emmy for his role in last year's "Closer".
He's also been mentioned as a possible future James Bond, partly because of a very interesting set of short films made by BMW to show off a new car and shown on the internet. They're called "The Hire", and they're about a hired driver (Clive Owen) who has a series of... interesting... jobs. *G* You can find them here: http://usa.bmwfilms.com/clap.asp?template=index&country=usa&film= . They're really quite interesting, each done by a different director. Not usually my cup of a tea, but I ran into them when they first came out and was impressed.
Anyway, I think you'll enjoy him in Sin City, if it turns out to be a good film... *G*. Here are some photos of him in other roles... and some of him in Sin City: