I like Bonanzle - quite a lot actually. Probably one of the most aesthetically pleasing auctions sites I've seen, very easy to navigate, and well laid out item page. (Emphasis on the seller/feedback with it being displayed at the top, along with emphasis on the item specifics like price, format, shipping, etc). Nice AJAX style cart addition as well. 
It would certainly be nice to see this site prosper.
Do you get much UK interest?
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