From http://marsrovers.nasa.gov/home/index.html:

SPIRIT UPDATE: - Jan 22, 2004, 10:35 am PST
The Mars Exploration Rover Spirit radioed a beep Thursday morning confirming that it had received a transmission from Earth. Still, it has not returned any data since early Wednesday. Flight-team engineers for NASA's Mars Exploration Rover Project are working to diagnose the cause of communications difficulties.

OPPORTUNITY UPDATE:
Plans for Opportunity's entry, descent, and landing are also underway. The spacecraft is on a correct course for its landing Saturday night, around 9:05 pm PST (Sunday, 5:05 am UTC).