Electroblogster posted recently at Unity of Truth about additions to Google Earth, and now there's also Google Mars. Fun and educational, the images are composites made from NASA data. The tool works similarly to the more familiar Google Earth, with three available views: Elevation (shaded relief), Visible, and Infrared.
Links at the top enable navigation to different regions or types of formations; you can also view landing sites for the spacecraft that have surveyed Mars -- or crashed in the attempt. Finally, a "stories" link brings up a list of locations with associated articles at the joint NASA/JPL/ASU THEMIS website. The picture above is a thumbnail of one of the posters available for download at the THEMIS site.
Cross-posted with Unity of Truth.