Platform similar to SubText that allows teachers to publish PDF, ePub, Word and Excel & classes / students can read collaboratively on any device. Documents are published using HTML5 = iPad friendly.
Technology Integration Matrix with video examples for every topic and level of integration. Not iPad specific, but a great place to start when integrating technology.
Students can create Trading Cards based on people, places, events...I haven't played around with it yet. Wondering about the ability to export content / share content from the app.
Cork board type app that allows students to organize research or a project on their ipad. The free version allows for one board. Online, collaborative version would be Wallwisher