This guy claims that this invention is a perpetual motion machine, the Philosopher's Stone of physics, the Holy Grail of power. Play the video and check it out for yourself.
The machine uses neodymium magnets and some simple mechanics to achieve its feat. It actually moves into its own for quite a while. How much is that while, we don't know. Of course, it is not going to be perpetual. Even if there was no friction — and inevitable energy loss — the magnets will lose its magnetism after a few years.
But even while the machine will stop because physics are just that stubborn, it's cool to watch. Magnets are always cool, and all the demos that lead to the machine are neat. [Thanks Oscar!]