If you are interested in what Mars actually looks on the ground, you need to check this out.

Someone named Lyle has put together a web site that takes raw feed images from the Mars Spirit rover and aggregates them onto a web site for viewing. This is from slashdot:

"I've spent a few hours hacking together some software to deal with the Mars Exploration Rover imagery at JPL. The software puts together a webpage and RDF feed of new raw imagery as it is posted to the JPL site, along with technical information decoded about how the picture was taken. It also produces stereo anaglyphs and color images that NASA has not seen fit to convert and make publically available. Be sure to also check out the ultra high resolution image of the lander as viewed from Spirit."

This is cool, and a perfect example of what someone can do on the Internet with a little interest, passion and expertise. So cool.