Mars Exploration Rover Mission Homepage
There's an image on the "Spirit" images page that I'm currently using as my desktop wallpaper. I can't get over the fact that it's a real, honest to goodness photo of the surface of another planet, taken, not from space, but from less than a metre from the actual soil and rocks. The Rover project is an incredible achievement and the images and scientific data the Rovers are sending back are already proving surprising. It's a damn shame the UK's Beagle-2 craft didn't make it, but at least we've got wonderful things like these, wandering round on Mars.