Here's a truly rare photo - the Phoenix lander descending with its chute open, taken from another spacecraft orbiting Mars. On the Scientific American website:
http://www.sciam.com/gallery_directory.cfm?photo_id=2B3A21F2-EDAC-40D3-4BB4500AF715240B
http://www.sciam.com/gallery_directory.cfm?photo_id=2B3A21F2-EDAC-40D3-4BB4500AF715240B