Lockheed Martin's Human Universal Load Carrier (HULC) is an actuated exoskeleton that helps a soldier carry up to 200 pounds of weight on its frame. It senses the direction that the user wants to move, and then moves in it. In the links, you find a video from the company showing the HULC in action.
http://www.popsci.com/technology/article/2010-01/robotic-super-soldier-suit-gets-more-juice |YouTube Video | Image: Lockheed Martin
This is just today's version of the bigger rucksack. And more battery-operated crap to have to rely on.
Like Shannon said, I would like to see the concept applied to helping physically impaired people walk.