There are 302 events in the 2012 Summer Olympics. This means that there are 302 Gold medals up for grabs. With this being said the winner must predict which country will win the olympics and also be closest in predicting the number of Gold Medals won by that Country. The winner will win a slabbed XF-40 Barber Half. (Pictures soon to follow). Good luck.
Here are the current standings (Gold/Silver/Bronze/Total Medals)
*edit: Peter says this contest is ok, remotely numismatically related plus the prize is a coin