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Original mission objectives were for Spirit to last for 90 Mars days (Sols, equal to about 24-2/3 Earth hours). So far, she has survived 1,423 Sols and is still limping along. She has sent back tens of thousands of pictures during her journey. I enjoy keeping track of her progress via unmannedspaceflight.com and the Mars Rovers home page.
Pictured is a really nice 1/18 scale die-cast model of the MER that was released shortly after the landings. It features folding solar panels and other movable parts, which include the high-gain antenna, camera mast and camera head, wheels, instrument deployment device, and rocker-bogie suspension. Its display base is the lander, opened up to prepare the rover for rolling off.