Spirit fully recovered!
Just read this on Yahoo news...
As for the ailing Spirit rover, NASA deleted 1,700 files from its flash memory Friday and then rebooted the rover.
"I am pleased to report it appears to be working just fine," said Glenn Reeves, chief engineer for the rover's flight software. He said NASA should be able to declare Spirit "fully recovered" by Sunday.
http://story.news.yahoo.com/news?tmpl=story&cid=514&e=5&u=/ap/20040130/ap_on_sc/mars_rovers_82
Very good news, lets hope this is the entire cause of the problem. The article also says it appears Opportunity found hematite in the soil around it using the mini-TES instrument. They will know for sure in a couple days.