I saw this online and thought it was just about the coolest thing ever usmechatronics.com/usmgarage/WiiBot.html, they basically connect a Wiimote to a computer to an industrial robotic arm. They use it to mimic the motions of the player for Mario Tennis and hooked up a tennis racket. Taking things further they mimicked the motions for Twilight Princess, and oh yes they even attached a real sword.
Anybody with a Wiimote (downloading the bluetooth drivers) and a Lynx arm and some minor programming ability should be able to do roughly the same at a smaller scale with a few days of work.