DARPA already has their first prototype done, and they say they're on track to "provide, by 2009, a mechanical arm that closely mimics the properties and sensory perception of a biological limb." It sounds pretty great, and I can't say having Dean Kamen and DARPA both working hard to create top-notch bionic arms is a bad thing. Click through to read DARPA's whole press release and a picture of the arm in action.