Here are a few more apps you might want to give youself or students a chance to explore on as they offer some great learning opportunities.
Caster Free: This great free app lets you create, edit and publish podcasts in the simplest manner. Great app for students in the classroom.
Idea Sketch: Idea Sketch lets you easily draw a diagram - mind map, concept map, or flow chart - and convert it to a text outline, and vice versa. You can use Idea Sketch for anything, such as brainstorming new ideas, illustrating concepts, making lists and outlines, planning presentations, creating organizational charts, and more!
Paperdesk Lite: Leave behind your paper notebook for your next class lecture or meeting. PaperDesk is a simple, easy-to-use notebook replacement made specifically for the iPad. The entire design goal behind PaperDesk was to mimic, as closely as possible, a simple pad of paper with no unnecessary frills. Yet it still boasts features that enable quick and responsive note taking. PaperDesk allows you to keep a "Desk" full of your notebooks.