The voting system should be revamped (and probably rebooted). You shouldn't be able to double vote at all (not imediately, not in a week, not in ten votes). Names should be given to at least some of the stars ("perfect", "great", "good", "average", "bad", whatever) in particular names that are consistent with traditional video game reviews (which aren't the same as for movies - find inspiration in Gamespot, metacritic, etc). A formula that eliminates outliers (95th percentil and above, 5th percentil and below) and that pushes games with few votes to the "average" score (look above at names) should be used.
About predictions, I'm a fan of prediction markets, though the rules at the simexchange aren't the best. There are far better examples of prediction markets which work great for futures (which is what you do around here, with weekly sales), see the Foresight Exchange. As a curiosity though, the 360 has just passed the PS3 there in worldwide sales expectations, which I think is a first.
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