I received one of these a couple of years ago as a Christmas gift. Nice liitle cart - works as advertised. I can pivot the bike on the stand and spin it 360 and just move it anywhere.
EDIT: Looks like my pic got nuked - it was a stock pic from the web, must have been a no-no.
Here's the link to the mfg: http://www.legalspeeding.com/Park-n-Move.htm
they have a couple of videos on there that do a good job of showing you how it works.