[bthomas]

Is there anything about App Store guidelines? Curious if Apple is going to require any kind of IRB approval first.

[huxley]

Just to help those that aren't familiar with the acronym:

IRB = institutional review board, which commonly also includes ethics committees

http://en.wikipedia.org/wiki/Institutional_review_board

[semi-extrinsic]

The other big issue I see is: if you try to do any kind of population or cohort study with this, how on earth do you correct for the bias that comes from only sampling iPhone users? It's borderline facetious to claim that there is no sampling bias, and it will be a nightmare to control for.

[Fomite]

My guess is that some of this will make field collection with iOS devices easier, rather than relying on the user's device.