They have an incredible exhibit of the view of Earth from space at the Tech Museum. It’s a sphere-shaped screen (3 dimensional), with four projectors projecting a rotating, moving image of the Earth. I don’t know if the cloud cover was updated in real time (like XPlanet), but the effect was incredible. I found myself mesmerized by it – I SO want one of these in my office! A giant version of “Earth” from Snow Crash. Awesome. 🙂
Here’s another view.