Enter what you're reading or your whole library-it's an easy, library-quality catalog. LibraryThing also connects you with people who read the same things.
Free animated video creator. Includes the cool handwriting/whiteboard technique that's popular today (like the Sir Ken Robinson Educational Paradigm video). Can connect to the app via Google Docs, which means students don't have to create their own accounts.
This looks like a great app for collaborative projects, but I also like the Featured Timelines. I just used one of them to do a lesson with my library assistants.
http://www.hstry.co/timelines/1-the-history-of-the-web
Site allows you to create timelines that include pictures, videos, etc., then share them on websites, blogs, and other media. Free service allows for up to three timelines.