Well... unless it had some thief protection.... if the one who stole it might be dumb enough to actually use it and if you have like skype loading with windows I think the police can track the last IP address you were logged from. Although if I steal a laptop im not gonna turn it on straight to windows - instead will first wipe the disk so chances are not in your favor... I guess you will have to rely completely on police for that
Clouds and automatic sync could also help (in case they turn it on)