From FCW.com:
If you’re getting drenched in a downpour or jostled in a Jeep, consider yourself lucky if you’re using the GoBook III notebook from Itronix. This rugged device meets MIL-STD-810F specification for shocks caused by drops and is built to withstand rain, snow, wind, dust, fire, vibration and chemical exposure. The die-cast magnesium chassis can take a beating. And if you’re worried about extreme cold, you can purchase an optional hard-drive heater.
You don’t truly appreciate a ‘rugged’ notebook until you witness one being thrown across the room – to no detrimental effect.