The Spirit lander isn’t completely dead and they’re working with it to get it operational again. NASA is currently citing “file managment” problems. Also, Opportunity has landed in a crater and is sending back loads of images. See here for the PR regarding Opportunity:
http://marsrovers.jpl.nasa.gov/newsroom/pressreleases/20040125c.html General info on both rovers and the program here:
http://marsrovers.jpl.nasa.gov/home/