Dunno if this has already been posted, but....
Looks link Dell's not the only ones affected by sony's exploding batteries:
Battery Exchange Program iBook G4 and PowerBook G4
Apple has determined that certain lithium-ion batteries containing cells manufactured by Sony Corporation of Japan pose a safety risk that may result in overheating under rare circumstances.
The affected batteries were sold worldwide from October 2003 through August 2006 for use with the following notebook computers: 12-inch iBook G4, 12-inch PowerBook G4 and 15-inch PowerBook G4.