Silvia Rosenthal Tolisano's blog where I had just seen her post titled What the iPad Is and What It Isn't. It
In addition to reading What the iPad Is and What It Isn't I recommend looking at Silvia's entire collection of presentations about iPads. If this school year is the first time that your students will have iPads in your classroom, scroll through I have iPads in the Classroom, Now What? You may also find iPads in Education - Examples from the Classroom to be a good source of direction for you and your colleagues.