Levitation using sound waves

[wanderingthomas]

_http://www.dailymail.co.uk/sciencetech/article-3291950/Star-Trek-style-tractor-beam-reality-Device-captures-lifts-moves-small-objects-using-sound-holograms.html

http://<iframe width="560" height="...vM" frameborder="0" allowfullscreen></iframe>

Sounds familiar doesn't it?