There's an absolutely amazing amount of Mars imagery available for public usage on those servers. But like I said you'll need NASA's own NASAview software to make sense of the images and export them as readable images - and it's almost unusably unstable on Mac, I had to try several times to export the images I wanted before success because it was crashing every 30 seconds, perhaps the Windows version is much better. Those who would accuse NASA of covering up findings from Mars should do their research properly and use the raw data that's publicly available instead of playing with a toy like Google Mars.
The lesson to be learned is don't use software like Google Earth for anything than other than entertainment and casual research. And I say that as a Google Earth addict.
It's in NASA and ESA's interest to have clean unfiltered unprocessed raw data to look at and it's in Google's interest to have interesting looking imagery that is heavily compressed to stream it to your PC as fast as possible to make your exploration of Mars as fun and quick as possible.
edit: There's apparently a GIMP plugin for reading the .IMG files, but it appears to be Linux only.
Edited by Archimedes, 13 June 2011 - 08:00 PM.