The problem with most of these computer screens is that they aren't very readable in sunlight. I've been through about 3 different touch-screen computers that I thought would work good for doing the sketch portion on site, but end up going back to pen/paper every time. There are a couple of good choices that I'd like to try out. They have "reflective" lcd screens that actually look brighter in sunlight, however the prices are still in the $3000+ range. (There are a couple of models of PDA's that have reflective screens, but PDA's are pretty limited.) I figure in a couple of years, the reflective screens should be affordable enough for me to try, but until then, stuck with the pen/paper in the house, and notebook computer in the car.......
As for the camera integrated with the computer, I tried a Sony Picturebook (notebook computer with built-in digital camera) for a few appraisals, but have gone back to a regular digital camera again. In theory, having the integrated camera would be nice, in that you have one less thing to carry and it automatically saves to the computer you'd be using to create the report. However, the problems that I had outweighed the gains. The sunlight makes the screen hard to see, and the screen is what you use as the viewfinder. Another thing is that you have to wait for the computer to boot up, and that minute can seem like an eternity sometimes. The only other problem I remember......computers drain batteries pretty quick.