Driver's license (New York)

Hi there.

Any clue on how to get a driver's license here in NYC? I've got my Italian license, but, as far as I know, it's not valid here because I've been here for more than three months.

I guess several people have gone through this before, so I thought I would write this post and get some advice.

One more question: if I get a driver's license in NY, will it be valid in any other state?

Thanks,
fabio