Many features have been added in the last couple of years for displaying photos, Wikipedia entries, 3D skylines, and more. Here’s two that are new to me.
This site has a long discussion of how to download high-resolution 3D images of structures around the world, created by real people and uploaded to Google’s servers. The article focuses on buildings in Disneyland contributed by adoring fans, but there’s more being constantly added around the world.
And recently someone discovered that a basic flight simulator has been built into Google Earth. You’ll need to know the keyboard controls to start it and operate it, but the reward for simulator fans is a flight on an F-16 over Google Earth’s highly-detailed photos.