Leaving the scene of an accident is a crime, the police should be treating it as such, if they arent make an official complaint, they'll have their asses hauled up over that. Contact your insurance company immediately, they need to know so they can begin the chase as well.
How's the car... and more imporantly... how's her neck?

I'd get the missus checked for whiplash, leaving the scene of an accident where someone has been injured is a serious offence, and the offender could have a whole host of problems coming his way fast... I'd make sure he did, dunno about you!