I would like a clone like ebay, well actually more like bobo.com.
Feedback like ebay
User details registration etc
Blog (per user) See [url removed, login to view]
Ajax components when possible. User a framework such as Google web toolkit.
5 image upload with resize
International options like ebay
3 templates the user can use for uploading auctions
Email updates on auctions to buyers and sellers.
One username for a buyer and seller.
Extra db required that will need to be disabled by admin at launch:
Database of products sold and links to official sites
Database of products linked to names which will be maintained by admin. Will allow user to add the linked names to his or her auction
I think that's about it. Let me know if you need to know anything for clarification.