This is the Back To The Future levitating hoverboard desktop toy available from ThinkGeek ($40). It floats on a series of rare earth magnets and will hover back and forth after given a push. Sadly, it is probably the closest many of us will ever come to getting to play with a real hoverboard. Even sadder, some of us won't even get to play with one of these because $40 is $40 and lunch and dinner don't buy themselves no matter how many times you insist you're a crooked food critic who's willing to exchange a favorable review for free appetizers.
Keep going for a static shot.
Thanks to Lillian, who agrees the best desktop toy is still an original Nintendo console.