The interface is very similar to Google Maps, but with some sky-based changes. The main change is that the tools which are normally “Map”, “Satellite” and “Terrain” have now become “Backyard Astronomy”, “Infrared”, “Microwave” and “Historical”. I think they’re pretty self-explanatory.
Enough talk — go check it out! Here are some screens if you just want a quick peek:
Updates — A few other sites have more detailed reviews of this product: