ehMac Trading post
I've already mentioned that I'm very impressed with the new site, so I'll just continue with some more suggestions.
I liked it when the classifieds were called the trading post. it was simply more personable. But my main suggestion is to add a "tentatively sold" setting, so that the ad gets saved, and then either put back out there or confirmed.
This would be great because the difference between "I've shipped the item, the new owner is enjoying it, and I don't want anymore offers" and "I don't want anymore offers because someone has just said that they will buy, but they may drop out"