Robodog

This thing is bloody amazing. Defense Tech has a link-rich post on Boston Dynamics' BigDog-- a project to develop a robot dog that can be used as a mechanical packmule by the infantry.

There's even a link to some remarkable video footage, which includes a demonstration of how you can give the 'bot a swift kick in the side and it won't fall down. If they ever put any AI in this thing, I'd think twice about trying that trick.