So why would a doctor or nurse carry an iPad with them when there's already a terminal in the patient's room, or several at the nurse's station, already running the client directly?
Forget doctors and nurses, the iPad would be a great device for patients to while away the boredom of being bed ridden watching canned TV programs. Most hospitals have wifi now.
Also, the iPad would be a great travelling device for RV'ers and motorcycle touring. It's about all you need on the road while you leave the heavy lifting PC's and laptops at home. The 3G enabled iPad would allow web surfing on those long stretches while RV'ing from location to location. You could even look up details on various points of interest along your routes while you drive.