Very interesting tool to use for your classroom that sort of turns your ipad into a document camera/ presenter tool. It has already won several awards in the Apple app store. You might want to take a look at this if you're 1:1 ipad as an option to get rid of document cameras or not buy them at all. Very cool
This app is Life Noted and merges camera, video, notetaking and more. It was recommended to me as a notetaking/ capturing tool for observation in the classroom by teachers of students, but I think that anyone evaluating another person might benefit from this sort of tool. Capture your notes and the speech about the notes and share it. Very interesting idea. It is free right now.
If you're using mindmapping and brainstorming in the classroom, this list from Mashable is updated and useful. There are a lot of new tools out (many of them paid but some not.) If your students are writing collaboratively, you should have them brainstorming collaboratively before they ever type the first letter of the paper or website.