I just tested the ipi studio software for markeless motion capture. Here is a video showing my first reults and impressions
http://www.youtube.com/watch?v=qLs47t4ROw8&feature=player_embedded
It uses four Playstation 3 webcams to do motion analisys by pixel tracking. The motion can be exported to various formats. It’s quite impressing to see it guessing my body position but it is a bit limited: it can track only one body at a time, we can’t move too fast and some position are difficult to track (I think when the arms are close to the body for example). But when we know the limitations and use it accordingly I think we can save some time depending on the project we are working on.