They mention some of the features that makes the Toughbook line from Panasonic attractive to many laptop buyers:
The casing is made of magnesium alloy and should withstand bumps and minor drops that might crack plastic casing notebooks or their LCDs…..it will take a beating better than standard notebook computers. The hard drive is also shock mounted for better protection of those spinning platters and delicate heads. The internal optical drive in permanently integrated into the W4’s casing and is surprisingly light, thus the W4 weighs less than other notebooks such as the ThinkPad X41 which lacks an optical drive.