This is the bomb. And I don't care if only dorks still say "the bomb."
It combines satellite imaging with other stuff, and you can look in detail at most parts of the world. It's nifty looking around at satellite photos of my city and the surrounding areas. You can just type in an address and look at it. You can toggle the map to show roads, topography, restaurants, etc. You can get directions. I've noticed some of the restaurant listings around my house are wrong (there is NOT a Del Taco around the corner from me), but overall it's freakin awesome. It's the WHOLE WORLD!