In an update of the Mars rover's situation, the flight controllers have indicated that the plans will switch to surviving the upcoming Martian winter rather than trying to extricate Spirit from the sand trap where it is stuck. The story from Cosmic Log is linked to below. Follow that link to read the post.
"Right now the rover is embedded ... we do not believe it's extractable," Doug McCuistion, director of NASA's Mars Exploration Program, said today during a teleconference. "Right now the worry is about getting through the winter."