ABC News has laid it on the line with a story, "the eight numbers that identity thieves want", with the link for the story here. This is one of those annoying articles where you have to click separately to see each tip.
Most of these are rather obvious (like social security number). Some of them are more disturbing, like IP address, or health insurance account number. If you think about it, it's still far too easy for thieves to get a hold of home addresses (even if not listed) because we have to carry them around on our driver's licenses and passports. (Oh, the want passport numbers).