The Google Earth Blog has an article about this pretty cool interface. Be sure to head on over to their site to check out the video and the links. Here is an excerpt : "The technology comes from UbiqWindow and lets a computer screen be projected in mid-air. They have devised a touchless way to interact with the "hologram", and Google Earth is a great way to show off its capabilities. it's not a 3D projection, just 2D. But, it sure looks cool. via Google Earth Design"
Read more of this story at Slashgeo.