Panasonic has just recently released the Toughbook U1. It includes the following features:

• Intel Atom Processor - Can run full Vista or XP.
• Solid State Hard Drive, IP54 (4-foot drop to concrete)
• Barcode, GPS, Camera, WiFi, Bluetooth, 3G Options
• 9 Hour Battery Life, Hot Swappable Battery
• 5.6″ LED Touchscreen w/ Full QWERTY Keyboard

I can see a lot of potential for these devices for both field workers and as vehicle mounts. They run about $3000, somewhat more than an industrial PDA; however the screen real estate is outstanding (1024×600 vs 320×240).

Also considering that this is a full OS (not a simple mobile edition) your existing desktop applications can be used and developed for it. Keyboard is a bit small on these types of devices, but the touch screen can definitely be leveraged instead. Here is the link the the product spec sheet.