Looks a little half-baked – only 3 BMW M3s near Silicon Valley, and no Porsches? Otherwise, the interface looks nice, and I hope they crawl more inventory, including pre-owned.
It reminds me of the ill-fated Google Real Estate search (http://google-latlong.blogspot.com/2011/01/retiring-real-est...). That said, Google was going up against strong competitors in Trulia and Zillow at the time, and there doesn't seem to be a strong competitor in the car search space.