Yeah, Sprit (MER-A) died. She got stuck in some kind of soft soil, and was kind of trapped at a bad angle for the solar panels over the Martian winter. Couldn't get enough power when the days got shorter. I'll bet that if you could get to Gusev with a battery & a set of jumper cables, she'd fire right up.
It's astonishing how much autonomy this new generation of probes have to possess. It amazes me just how big the universe really is. The solar system is just our back yard, and it takes six minutes one-way for radio messages (instructions from Earth, and data from Mars) to pass. The machine has to kind of think for itself. On the surface, that's not so tough. It's programmed to stop and ask for directions. In flight, OTOH...
From the director himself, here's "Six Minutes of Terror" (2003).
http://www.youtube.com/watch?v=tZRXwRybb1I&feature=related
Also related, the next generation rover "Curiosity" (MSL) arrived at the Cape on June 23.