Flash Earth: Google Maps + MSN Virtual Earth + Flash mash-up
Eventually all of these cartography hacks are going to grow tiresome, but not just yet. Flash Earth is basically a Flash front-end that combines satellite images from Google Maps and MSN Virtual Earth. It lets you drag the map around with the mouse, zoom in and out with a pleasant fade effect, and switch between satellite views from Google and MSN on the fly. It doesn't include a lot of the more useful features of those map sites like location- and route-finding, but who needs useful when you've got nifty?
Also, be sure to click on the narrow gray bar on the left to see a few more fun Flash experiments.