We knew we were going to have to do this eventually, but it was just one of those flows that got the all too familiar "1-2-3 not it!" between the 2 of us.  Anyway, you can now edit your auctions via "My Account -> Auctions Listed" as long as the auction doesn't have any bids on it yet.  You can also add photos, but we still need to add management of previously uploaded photos ... maybe tomorrow ... or ... right now, even though it's 3AM.