I recently tried out an MMO Rhythm game, and it's really fun! Also, rhythm games can improve your hand-eye coordination.
It's Japanese though, so you may need to follow tutorials at djmaxus.bemanistyle.com if you want to register and play. The Japanese site is http://www.djmax.jp
Here's a video of it in action: http://www.youtube.com/watch?v=B1FoSHqBDJ0
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If the phrase "you are what you eat" is correct, technically we must all be cannibals.