Decision markets
I have always been enamored with the idea of decision markets - and I think that Inkling Markets does a really good job - anyone can create a market. They really should move to Ireland and let people begin to play with real money, it would make it a lot more interesting and the results more useful. Economic rewards could be created for those who create popular markets and for those who accumulate trading gains.
Here is a decision market on the value of Facebook - however, there is not much liquidity. I would really like to see these decision markets catch on - they are more fun when there is more liquidity.
