It would be really useful if Spiral Knights had a player driven Marketplace/Auctionhouse. Instead of standing around in the Bazaar trying to sell stuff, we can be playing the game more while checking our Auctions like energy prices. Not to mention this would also help a lot of material traders setup a price, because currently a lot of the materials seem to have no stable price except shards.
See this thread: http://forums.spiralknights.com/en/node/2043