Google Earth is a desktop software program that lets users browse and search the earth and its topography. The program takes advantage of specially created data layers that can add all sorts of features to the surface of the earth, including local landmarks, businesses, and any other set of data that have been specially coded to match up with the earth's geography.
In addition to static layers, Google Earth is also capable of displaying moving sets of data, a feature that has been used to show changes to the earth over time, both long and short. One of the most notable uses of this was to show hurricane Katrina's movement into the Gulf Coast back in 2005.
Winner: Google Earth (Earth.Google.com)