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David_Gerard comments on Evolutionary psychology: evolving three eyed monsters - Less Wrong
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Now I'm curious why, as far as I know, no animal has ever evolved an eye in the back of its head. You mention bipedality and descent from trees, but why wouldn't a gazelle or a fly or a small fish get an advantage from one?
The flatfish has one eye that moves to the other side of its head.
Edit: to clarify: two eyes, one of which moves to the other side of its head as it grows. Richard Dawkins is fond of this example, using it in The Blind Watchmaker and The Greatest Show On Earth.