Space.com is carrying this update on the long-lived rovers. Opportunity has reached its latest destination, Victoria Crater, and the images it has returned show great promise:

"This is a geologist's dream come true," said Steve Squyres of Cornell University, principal investigator for NASA's twin rovers Opportunity and Spirit. "Those layers of rock, if we can get to them, will tell us new stories about the environmental conditions long ago. We especially want to learn whether the wet era that we found recorded in the rocks closer to the landing site extended farther back in time. The way to find that out is to go deeper, and Victoria may let us do that."

Pretty good progress for an interplanetary riding lawn mower, no?