After watching some history shows about ancient Greece, then playing with Google Earth to figure out where they took place, then looking at Wikipedia to learn more about the events, I suddenly had this idea:
How about a module for Google Earth where you can scroll through history, with a timeline scrollbar on one side, where you can select the start and end dates, and then Google Earth will show you how the Earth looked at the time you scroll to (and change as you scroll).
You could then get the relevant articles in layers from the relevant time period and location. That would really make history come alive! Especially if you could incorporate all the 3-D reconstructions of ancient sites into Google Earth's 3-D buildings feature (or whatever they call it).