Just came across a couple of thoughtful and relevant posts on EdApps (one of the only Canadian iPads in education sites) about teaching digital citizenship with and for the iPad. The author brings up issues about multiple users on devices (eg. iPad lab) and best practices. Written with elementary students in mind but could very easily be adapted to high school:
They also created this great poster for how to use the communal iPads:
I think I will be posting this in the library. Thanks EdApps!