Nasa has released a comprehensive world viewing tool that allows you to zoom from planetary resolution down to where you can pick out individual streets. Really cool, but it needs a good internet connection and a decent graphics card. There's all sorts of interesting features, such as the ability to tilt your view for a flight-sim like experience and a data display feature that shows current natural disasters, political boundaries, weather patterns, and landmarks on the Earth's surface, all while providing a dynamic satellite's eye view of the planet.”
Of course it's already Slashdotted.1
1 A site is slashdotted when its server dies under the weight of the flash crowd suddenly and unexpectedly directed there due to a link on slashdot.