PDA's Sturdy Enough for the Rugged Outdoors?

Phunction asks: "So what is available in the sturdy outdoor/industrial handheld market? I currently develop software for Casio's line of outdoor handhelds only slightly larger than regular, but they can't handle cold weather very well, below 0 celcius, and the screens are not to good in outdoor light. And I only know of one other manufacturer, At Work Computers, but they are almost 3 times the size of a regular pda. The OS is really not a concern, however the hardware should be water proof, handle low tempratures and have a good reflective screen that works well in direct sunlight (like the iPaq)."