The CS monitor has a nice writeup of what's next for the two Mars rovers. They are both running well, long past their sell-by date, and both have more interesting formations in sight. Spirit, having climbed out of Gusev Crater, could possibly make it to Home Plate, a very oddly colored terrane out on the undisturbed Martian floor. Opportunity conversely is trying to get down into a crater.
My own opinion about the likelihood of life outside Earth has definitely changed over the last year-and-a-half because of all of the details of the water history of Mars. More fun to come!