Rock solid site for used car search. Think the interface could be improved a bit but generally it's a good way to find whats available in your market. Haven't bought from here yet but I'm a big used car guy so think I'll use it next time I'm on the hunt for some new wheels.
Outstanding experience buying Super Bowl tickets on SeatGeek. The interactive maps were easy to use and their deal score functionality made it simple, and when I wanted to buy my tickets they made available a phone number where I could call in an talk to a real person to complete the deal. Awesome seats in Section 204 at Met Life to see my Hawks win it all!