Here's another exoskeleton. http://www.liveleak.com/view?i=9fe_1188407948
This one uses different technology than the other one I posted. This one interprets nerve activity from the brain to muscle signals. The other one uses "get-out-of-the-way" technology and from what I can tell, only has force sensors in the end effector.
Both are pretty clever solutions with advantages and disadvantages for each. Regardless... very cool.
Here's the vid of the other one for reference:http://www.communistrobot.com/viewblog.php?id=591