Sooo ladies and gentlemen, i've got two suggestions.
Making it clear: I did not researched alot, so sorry if that had already been posted.
Also, making it clear: I am welcoming critic, but be nice and/or give your own idea (if you have one), i am not going to feed the trolls here.
The first is too obvious, altough amazing: Graphs of the market prices, making it easy to monitor the market, make projections or get informed about if the price is going down or up, and how much. That was the first thing i thought when i saw the CE market, and i'm surprised that it was never implemented.
The second would be a Official Three Rings app for Android/iOS which could give you acess to your arsenal and auction house on your smartphone/tablet. Bid wars would get even more interesting, and you could renew auctions even when away from keyboard.
I can't comment on the actual ideas, seeing as I'm no market guy, but...
EDIT: You edited it out. Nvm.