I've been thinking about the "Sell my car" idea for a bit. I think it's ripe for new thinking. If you're interested and in the SF Bay Area, ping me at ahconsidered@hushmail.com
Just a tangent here... I donated a car to charity this past year and was really pleased with the outcome. The charity was able to sell the car at auction for more than a dealer and a private party offered me locally - so everybody won. Chances are I will do the same in the future, and would encourage others to do the same, IE: it's an easy way to help a charity. That said, while you are thinking about new ways to move used cars, you might also consider how to get into the charity auction business for cars. Reason I say this is that I was able to donate my car to a large, well-known national organization, but I actually approached several local/regional groups first. The local/regional groups were horribly organized - didn't return phone calls, etc. Perhaps there is a social-good angle you could take, if you are exploring this market, as there are many worthwhile groups that just don't have the organizational skills to handle processing the cars.