I LOVE your effort here, and would love to see you give ebay a run for its money. I'm a long time successful ebay seller and am fed up with ebay... but can't find anything that even approaches ebay in functionality. I think ebid has potential, but it is VERY difficult to use. I am in the US.
Suggestions:
Start a forum just for US users (and perhaps for other countries as well).
Two of my three auctions are not showing up on the searches, but I can't find any contact for support. You really need to provide support to new sellers.
Provide "completed" search data. Buyers and sellers both need to see # of bids, final prices, etc. I like your hit counters and the number of hits is why I decided to spend so much of my precious time trying to use ebid, but I can't find items that actually have current bids.
Encourage sellers to work together to draw buyers and merchandise to ebid. Perhaps provide some sort of incentive to sellers.
Allow photos to upload with their names. Having to re-name them after they are uploaded is time-consuming and confusing.
Figure out a way sellers can use Turbolister. Anyone can get it for free and it works great on ebay. Turbolister can be adjusted for use with sites other than ebay, but I haven't tried that in a while.
Clean up the look of your format--listings are cluttered, difficult to peruse, and just don't look nice. I suggest you copy ebay's format ... it's what everyone is accustomed to and will make buyers feel much more comfortable.
Sorry ... I'm just frustrated with all the time I'm spending evaluating ebay alternatives. There is HUGE potential for someone to make as much money as ebay has ... I wish I could write program code (instead of listing descriptions) or I'd try it.