From what I've been hearing there is a small closed exchange in invite-only beta right now, I think 500 or 1000 actual traders. It's designed by one of the guys from Citi and will offer things like an actual float with short-selling, put and call options if holders want to write them (I would probably use this myself) or buy them, etc.If that one takes off it will invite a flood of pros into the game and liquidity will flourish, leading to steady prices.