Tim, this is a pretty big undertaking I think and would require a fair amount of research. Hightower has made a very good point about not being able to identify people.
For remote use:
I THINK some high end nikon DSLRs like the D300 and above (ones with live view) have the ability to control them from a computer and download images directly to the hard drive. Its a system used in many photographic studios. Nikon sell a wireless adaptor for the high end DLSRs but you would need to sell at least one kidney to pay for the equipment. Controlling it over broadband could be a problem. One solution might be to set up a webcam on top of the camera that shows roughly the same frame coverage as the DSLR. That can be easily set up to view over broadband I'm sure and then the camera just needs a remote shutter and download facility. To be honest, I think it'll be a waste of time.
The best thing would be to have an on board camera that you use throughout the day. Buy a cheap Nikon DSLR, a D50 or something and the Nikon 10.5mm fisheye lens (lens is about £500 though) or a wide angle. Shoot in JPEG then upload straight away when you return so customers can view the picture immediately.
Let me know if you ever need a photographer
EDIT: come to think of it, the computer thing with the nikon cameras may only be for downloading the images and not for remote controlling.