Both Mars rovers have far exceeded their “warranty” and despite setbacks from time to time, have bounced back to carry on with their extended missions. The Spirit rover is currently limping (backwards, on five out of six wheels) toward it’s winter resting place atop a hill named “McCool.”
From Jet Propulsion Labs:
Mars Exploration Rover Mission: The Mission
Spirit Continues Driving on Five Wheels:
Spirit continued to make progress toward “McCool Hill” despite a reduction in solar energy and problems with the right front wheel. The team plans to have the rover spend the winter on the hill’s north-facing slopes, where the tilt toward the sun would help maximize daily output by the solar panels. On Spirit’s 779th sol, or Martian day (March 13, 2006), the drive actuator on the right front wheel stalled during a turn to adjust the position of the rover’s antennas. The stall ended the day’s drive, which brought Spirit 29 meters (95 feet) closer to McCool, still approximately 120 meters (390 feet) away.
Engineers conducted tests on sols 781 and 782 (March 15 and 16, 2006) on a testbed at the Jet Propulsion Laboratory as well as remotely on Spirit. Further analysis is needed to determine what caused the right front actuator to stop working. Meanwhile, the operations team has successfully commanded Spirit to drive using only 5 wheels. Engineers plan to have Spirit continue driving backward with five healthy wheels while dragging the right front wheel.
Replacing the Joint Unmanned Combat Air System –consisting so far of two Boeing X-45A prototype smart aircraft and a Northrop Grumman X-47A demonstrator –with a longer range unmanned aircraft will save $158 million next year.
SUITSAT IS SILENT: Space is cold–apparently too cold for SuitSat’s batteries. The Earth-orbiting spacesuit stopped transmitting shortly after it was thrown overboard from the International Space Station on Feb. 3rd. Probable cause: lack of power. 
January 30, 2006: Moondust. “I wish I could send you some,” says Apollo 17 astronaut Gene Cernan. Just a thimbleful scooped fresh off the lunar surface. “It’s amazing stuff.”
Damsel and I have had the privilege of visiting the B2 production facility at Palmdale, CA, Air Force Plant 42 during an open house. After the factory walk-through, we went out on the tarmac for a presentation ceremony. At the conclusion of the presentation, we were treated to a low-altitude flyby of the Spirit of California. It was truly a breathtaking experience for us. Unfortunately, we didn’t get any pictures since cameras weren’t allowed on that part of the base. But not to worry – Richard Seaman (a friend of a friend of a friend, etc.), was at the 2005 Edwards Air Show and took some pictures and put them on his website. He also provides lots of informative comments as you scroll through the pictures. There are some useful links at the bottom of the page as well. Just awesome! Go look at the 
January 26, 2006: One of the strangest satellites in the history of the space age is about to go into orbit. Launch date: Feb. 3rd. That’s when astronauts onboard the International Space Station (ISS) will hurl an empty spacesuit overboard.