The Mars Rovers have been very, very good -- and they've been lucky. Early in the mission both of them got cleaned by dust devils, removing a lot of accumulated dust on their solar panels. Recently, Spirit has been losing considerable power as the dust built up. But though it didn't get hit by a dust devil, it apparently did get a favorable wind gust. I doubt it'll make it through the next Martian winter, but it's doing OK for the summmer.
Martian Winds Help Earth's rover Spirit
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