Google goes beyond Keyhole
Lets start with the big things first. On selected US cities, you can view a grey scale 3D rendering of the city skyline. Pictures are worth more then words so I'll let the screenshots do the talking.
Cool. Beyond the city skylines you can see transit routes, terrain features and animated user defined paths.
Check out some more screenshots and features. [link]
Note: The link site, at the time of posting, was running a little slow.