Get as much information as possible, license plate, year, make, model and color of the car, witness statements, drivers name, age, address, driver's insurance information. If the police are called to the scene get a copy of their report. Have your bike inspected by a LBS (or two or more if you have multiple shops in the area). If paramedics are dispatched to scene (and they might be as a matter of SOP) and they advise you to go to the hospital to be checked out take their advise.

List everything that was damaged:

any and all components on your bike
helmet (even if it isn't scratched but your head hit the ground replace it)
clothes
gloves
water bottles/hydration pack
backpack
pannier bag(s)
messenger bag(s)
top bag
saddle bag

DO NOT post details about the crash to this or any other forum, insurance companies DO have lawyers/investigators/interns who's job it is to surf The Net looking for any and all information to get their clients off. If the driver was clearly in the wrong do not accept the police's assertion that you were to blame.