Maggie,
I would use an on tablet camera, I guess in tablet lingo it's a "rear-facing" camera more than a front facing camera. I would use it when I am cataloging items I am researching or doing my initial inventory recording. I have learned it is actually nice to add a photo of something when I am entering the other info. It does not need to be more than something to let me visually confirm the item matches the other data in the record. Having the camera on the device under Win7 will let me use the app I wrote simply grab a photo(s) from a predefined directory.
Later I believe I can add the ability to directly capture the image as it is taken but for now just being able to get the photo as part of the normal workflow would be wonderful and a lot faster than trying to shoot reference shots, moving the photos over the the device then importing them into the record.
I also discovered an iOS app that can actually give measurements of something in a photo. I never really tested it but there is another use that would be really nice but for me. And we know what is nice new feature for one person is bloatware for another.