It's an interesting concept and I like where you're headed w/ the design. This could be interesting if you could build it out in a highly concentrated area such

It's an interesting concept and I like where you're headed w/ the design. This could be interesting if you could build it out in a highly concentrated area such as NYC. Can you add Google Maps and make it location based? Another thing you can work on is pictures. If someone is "Selling a Wacom Bamboo usb tablet for 40 bucks", I'd like to see what it looks like beforehand. Once you have traction, maybe you could create a partnership w/ Bit.ly. How about seller ratings and history? Interesting concept and with the right execution, I think you can make it work.