The Mars rovers were amazingly successful and continued to function well longer than anyone expected. It was a minor miracle that they even survived the landing and everything deployed as planned. They got so much data from the rovers they actually made an IMAX movie with the gigapixel imagery! Scientists have found tons of evidence of water and more, but they are extremely hesitant to discuss because no one wants to be the scientist ridiculed for saying aliens existed on Mars. Here's an article that discusses a little - http://www.msnbc.msn.com/id/4480097/