Reposted from the NASA website here:
NASA Google Mars
Imagine traveling the surface of the Red Planet, observing millennia-old canyons or viewing Martian dust devils first hand. Now, you can with the advent of a new Mars mode in Google Earth that brings to everyone's desktop a high-resolution, three-dimensional view of the Mars.
Besides providing a three-dimensional view of Mars that will aid public understanding of Mars science, the new mode, Google Mars 3D, also gives researchers a platform for sharing data similar to what Google Earth provides for Earth scientists.
The mode enables users to fly virtually through enormous canyons and scale huge mountains on Mars, higher than any found on Earth.
Viking Lander on the surface of Mars. Credit: NASA/Google Earth. Users also can explore the Red Planet through the eyes of the Mars rovers and other Mars missions, providing a unique perspective of the entire planet.
Users can see some of the latest satellite imagery from NASA's Mars Reconnaissance Orbiter and other probes orbiting the Red Planet, as well as learn about new discoveries and explore indexes of available Mars imagery. The new Mars mode also allows users to add their own 3-D content to the Mars map to share with the world.