You see a picture of Earth from outer space, and after you type an address you fly in "like a superhero" all the way down to ground level, using real photography.
I was even able to see my pickup truck!
Then, you can jump all over the world.
Free for 7 days! Link at bottom.
Warning... it requires a good PC (no Macs) and a broadband internet connection:
Keyhole takes advantage of the 3D graphics capabilities standard on most desktop PCs shipped in the last four years. If you are using Keyhole on an older machine, or a notebook computer that does not have 3D graphics capabilities, you might not be able to run the Keyhole application. We currently do not offer a Macintosh version of the Keyhole client.
Minimum Configuration Operating System: Windows 98/ME, Windows 2000, Windows XP CPU Speed: Intel® Pentium® PIII 500 MHz System Memory (RAM): 128MB 200MB hard-disk space 3D Graphics Card: 3D-capable video card with 16MB VRAM. 1024x768, 32-bit True Color Screen Network Speed: 128 kbps
The Keyhole 2 LT client will work on most graphics cards from the following manufacturers: NVIDIA ATI Intel 3D Labs Wildcat Matrox * S3 * * These graphics card users must use the DirectX version of Keyhole. S3 SuperSavage graphics cards or better are required to run the Keyhole application. Note: Intel can use OpenGL, but should use DirectX.