Windows/Mac/Linux: Google's 3D mapping application Google Earth has just released version 5.0, adding historical imagery, maps of the ocean's floor, and even better features for touring the world from your desktop. The demo video pretty much says it all. The historic imagery lets you go back in time to see how the location you're viewing has changed over the years. For the cubicle-based deep sea explorers, the new ocean features integrate maps of the ocean's floor along with videos from National Geographic with Google Earth. Finally, if you've ever wanted to record a custom tour, a new record feature makes it easy to create and save tours of the globe. Looking good, GOOG.