Anyone sell stuff on ebay? I have an app idea.

I've got a really simple app I'm building for my wife, as she's starting to sell stuff. I was wondering if anyone here sells stuff regularly, and has active listings. My idea is really simple, it's a quick dashboard of your items with a place to comment and share on twitter and facebook. You can use the dashboard to check in on your items, as well as link to from your postings ("see my other auctions"). I have a prototype working, which I'm happy to share. Could this be an affiliate business? Anyone interested in kicking this idea around?