DescentBB

http://www.topgear.com/car-news/concept ... hoverboard

I'm posting this link instead of the Lexus site because this has a nice quick summary of how it works.

*edit*
Ahh.. the park has magnets built in it. bummer. Still, pretty cool.
http://www.lexus-int.com/amazinginmotion/slide/

It seems that now the concrete surface can be covered with a soft trauma safe coating, for example made of polyurethane.

That would be good as the guy in the video broke his ankle during filming.

So whats the smoke from?

50 oz of liquid nitrogen. It's supercooled.

All we need to do is prove the existence of and learn to manipulate the graviton and perhaps we can one day make an actual Back to the Future Part II style hoverboard.