TruthCoin
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Voters who fail to vote or vote against the majority will be penalized by losing coins, while those who vote for the "decision" with low voter turnout or ultimately vote for the majority result will be rewarded with coins.
The defense here is the assumption that the usefulness of the market will eventually lead people to vote "fairly" in the long run. I think this is an incredibly naive idea, but it might still work. The strong motivation to vote for the side you think will ultimately win, and the assumption that (in well-designed questions) it is likely to be true, is not absurd.
Intrade had counterparty risk, offered no return on deposits, had non-obvious fees, restricted who could take money from whom, and restricted what markets could be created. Truthcoin eliminates #1, #4, and #5, significantly reduces #3, and can offer a version of #2 if volume increases, for which it will be appreciated. and even it relies on trusting which transactions were made first
Dependent on an ID system.