The devices we are getting could be used in centers/tutorials. Students can create tutorials for students to view. Educational games could be played on the devices also. Students can also watch videos related to a specific objective. They could write feedback on what they viewed and learned though a blog or through edmodo. Students could also create videos for the class to view.
Expectations need to be set up at the beginning of the year.
Students could be assigned to devices at the beginning of the year and use that one only or somehow keep track of who is using each device. Sign in sheet for each device or something.
Leave plenty of time at the end of each period for clean up and to account for all devices before the students leave.