Here is a useful scheduling tool, I would imagine its best use to be to organize meeting times between teachers and students. Everyone can access the same schedule without the need to synchronize or coordinate multiple calendars.

A short article listing 4 benefits of using smartphones in the classroom. While I'm still not totally convinced, some good points are made here. The issue I don't ever seem to see addressed in articles like this, though, is how to keep students from going to facebook or their texts after using the phone for a learning purpose.