A solar-powered data center saves energy its own way (SearchDataCenter.com: Mark Fontecchio): Frankly, I think this may actually be a wave of the future. Time to buy cheap real estate in the California desert, folks. (No access to the grid required! Drill a well for water, dig a septic tank, and Internet access is your only utility need.) Given the success AISO.net is having here, I would be surprised if more small-medium sized data centers don't pop up where the sun shines almost every day.
Mapping, particularly quantitative mapping like GIS, and AWS go together like peanut butter and jelly (I have 3 small kids who have been out of school all summer, so this was the first analogy that came to mind). The utility computing of EC2 and the large web-addressable disk storage of S3 provide opportunities for developing and sharing of mapping products that previously were cost prohibitive.
Hell, with the spaceports going up in New Mexico, that state's deserts might not be a bad place to place your bet either.