Chicago Tribune story about prominent economists from around country linking up on one site (U Chicago biz school) to post competing answers to a weekly posted policy question. Site then polls the other economists and you get an agree/disagree/undecided number.
Another nice example of crowdsourcing, but one that highlights the Wikistrat difference: instead of just holding up the challenge in front of the mob and asking the crowd to yell out its answers, Wikistrat asks the crowd to work together, on the wiki, to strategize pathways, outcomes, options and impacts. It's that nonstop dialogue and debate in real-time that makes us different: not just a concentration of opinions but their collaborative interplay.
Still, another interesting example of thinkers reaching for something similar.