MOSR gave a silly idea recently, of the next large PowerBook including multiple hard disks. This is little more plausible than multiple processors in same, but that little bit means it just might happen. After all, there's plenty of room to spare! If a similar motherboard is used in each of the next revision of the PowerBook family, there will be space enough for a ginormous battery as well as multiple hard disks.
What does the current 17" look like under its case cover?