[jbattle]

A few thoughts: - I think CarFax has an affiliate program that might let you link through to their reports, keyed by VIN. These reports are a pretty valuable tool to shoppers as the condition of a used car is driving 50% of the buying decision.

- One data point that is really important to dealers is how long the car has been on the lot. Hypothetically you could just track how long the same car has appeared at the same dealership. The longer the car has been sitting there, the more motivated they'll be to sell it. I remember hearing 30 days is a long time for dealerships to sit on a car. For buyers this could be good information to have.

- Getting the mobile experience right would be a huge win. So often the cars the dealer lists aren't actually the cars they have on the site (I'm not sure how much of this is intentional and how much is a matter of how fast inventory turns over). So when you get to the dealership, you want to quickly and easily be able to comparison shop - get that right and you cover people in that really critical uncomfortable moment.