Managing ipads in schools

I would like to start a discussion on using ipads in education.  I would specifically like to discuss management issues.  I see two different scenarios, one being a mobile lab situation and other being a single ipad used by a teacher with a variety of students.  I would like information on such things as who can add apps, what itunes account do you use, what happens to apps when a teacher leaves and you no longer have the itunes account, how often do you synch, issues with the volume purchase program.  Any information would be appreciated.