There looks to be a lot of different things in that picture. In other words, it's not like somebody opened the image in Photoshop, pressed a button and bingo, it was done.
That said, a lot of the legwork looks like it's done with a photo filter (Layer > New Adjustment Layer > Photo Filter). Play with the settings and see where that gets you.
Edit: While we're at it, try manipulating the image using the Hue/Saturation dialog (Layer > New Adjustment Layer > Hue/Saturation) as well.
Last edited by BoldUlysses; 04-13-2009 at 09:59 PM..