I follow the NASA Jet Propulsion Laboratory web site that keeps daily track of the two Martian Rovers (Opportunity and Spirit) as they have been trekking across Mars since January 4th, 2004. Originally to have a 90-Sol day mission, they have outlived every bodies expectations and proceeded to provide data and pictures for over six years. Glitches in power, wheel mobility and software conflicts have occurred from time to time but like a Timex watch - they 'they just take a lickin' and keep on tickin''. No one can predict how much longer they can provide data and pictures but it is possible they may get through 2010.
JPL - NASA
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