There are already eBay iPhone apps.(not sure if you can list items, but you can def bid/watch).

It's more geared towards the consumer than the seller. It doesn't do any of the things I suggested for the startup. Specifically, streamlining the auction process by allow you to create auctions on the fly.

But this isn't my golden idea, and hopefully eBay DOES implement these features into the iPhone app. I think that'd make life a lot easier for me.

ah then that idea has already been done too. Was like a year ago, don't remember if it was a standalone site or one that piggy backed on craigslist

Using twitter (or similar) seems to a popular theme in the solutions.