Also, I don't know if this would be like a Craigslist where it's pretty bare bones with no fees to you, or eBay where it's got a lot of fancy stuff (that I could live without) and fees to you, but I would like to see reasonable fees. eBay + Paypal = fees that really add up. I'd like to see no listing fee (final fee seems reasonable) so that way people can list it and change their mind, or if it doesn't sell, no big deal. And longer expiration dates. eBay's 7 day auctions assume someone who wants your product will see it in that period. I'm more of a fan of Craigslist's month timetable (or longer)
And feedback is important. Even just a basic section where someone can say "great quilt, fast shipping", that's important to help future buyers