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Desrtopa 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?
Flies have compound eyes which allow nearly omnidirectional vision. Evolving a new eye when you've already got hair in the way is probably hard, since it would get in the way of a simple light sensitive patch as a starting point, and even if a specimen did mutate one it would probably offer a very weak advantage compared in a species that already has fully developed binocular vision and the ability to turn its head.
Some species have developed additional eyes evolving independently from their original sets though