This is totally cool, and I haven't seen it anywhere else yet. My brother sent me a link to some a video of dancing robots built by Sony. The articulation and smoothness of motion is amazing! I'd seen pictures of the robots before, but now that I've seen them in action I'm a believer.
The Window Manager informs us that the robots in the video are called QRIO, and that they were shown off at the recent Consumer Electronics Show in Las Vegas.
Here's a site with more pictures of what it calls the QURO, but appears to be the same as the QRIO. Passed on my an anonymous commenter in the wrong thread.