FreeGameDev

http://www.youtube.com/watch?v=WK2H-9HhAVA

http://www.ipisoft.com/

And all you need is a few cheap webcams (3 or 4) and a SM 4.0 compatible graphics card (which I lack otherwise I would test it right now).

It's available for 30days free trial, after that it is quite expensive though

But something like that would really speed up in improve the quality of humanoid animations.

This is quite an interesting discovery. Such a system could surely boost the look and feel of many advanced (= playable) games, assumed they could find appropriated actors (I do not see a nerd doing rocket jumps or rolls ).