Slideshare.net is a great source for presentations. Sylvia Tolisano is a prolific contributor to the learning community around technology and global collaboration. Here is a link to her "Ipads in Education Part 1"which has great tips for getting started.
In Part 2 asks the essential question, "What is the difference between transformative use and automated use of iPads in the classroom?" Sylvia displays some of her app choices and provides several activities using iPads in transformative ways.