Yeah, toughbooks tablets are pretty neat. They're also about 3 pounds and are full blown PC's, which sounds great but most workplaces have to endure much higher costs from maintaining and administering full blown PC's than they'd endure from a more limited device.
I've had to do a phenomenal amount of tinkering to get my tc1100 tablet to a lovable level of slickness. (A 3lb slate form factor PC.) We're talking about weeks of research, trying out software, buying components off of eBay and one afternoon of disassembling the thing.
The iPad is just about as useful to me after just one hour or so of App Store downloading. It's a bit faster to write posts with, even typing one handed. I haven't been able to sync the Bluetooth with my Plantronics 510 headset, though.