That's pretty cool if you REALLY want to do it on your phone. I haven't sold on eBay yet, but personally, I think it would probably be nicer to have a "quick sell" setup for the desktop. On the other hand, for managing the sale, I suppose you want to answer queries from customers, modify the listing, check the bids, etc even when you're on the go, so that would be real handy to have in a simple interface if supported.
I wonder if anyone has used anything like this, or has sold on eBay enough to know if it's helpful.
Also, security might be a concern as it seems to go through a third party app, maybe even server.
Have you used it cad, or just curious about it like me now that you pointed it out? Are you part of the sell it mobile team?