Dropbox (free)

Educators with notes and files scattered about different computers will love this application. By synching with other machines sporting Dropbox, users do not have to fear misplacing important documents - it even boasts the ability to read a number of different common file formats, too! Anyone with an iPhone may save their photos and videos directlyto the application as well. Teachers who come across great bits of online multimedia to enhance a lecture can save their valuable findings for future offline viewing and organize them into specific galleries.