Hi,

I've collected the four available Mars surface datasets for GoogleEarth plus placemarks and overlays for both Rovers in a single kmz file. For optimal viewing in GoogleEarth please turn off the 'Terrain' and 'Atmosphere' viewing options. Also choose only one of the four Mars surface sets since they'll interfere with eachother.

Mars MER pack.kmz (2,6 Mb)

The Opportunity overlays were snatched from this post at the Google Earth Community forum and the Spirit overlays were done by me. Feel free to make adjustments and enhancements since i've positioned the overlays optically. I had plans to add other Mars mission imagery but decided it would be best to leave that to someone more qualified.

Enjoy,
Rob

Here is a small movie (615 Kb) to give an impression of the Gusev overlays. (Movie should play fine in VLC or Quicktime)