actually, i just visited it for the first time tonight, and don't know if its currently the most popular. (i think i just read that there's something similar - futures trading experiments - out of some university in the midwest ... it was in one of those google articles, they're betting on the liklihood of it rising/falling.)
i came across it browsing the googleblog, which took me to a number of messages about people leaving various companies (especially beas) and heading off to google. and this was one of the favorite pursuits of one of their new guys.
it would be fun to see one that was a little more complete and active.
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