When you have a new toy you play with it. That's what I've been doing with my iPad. Yesterday I put on the Kindle software - very nice except the periodicals don't come through, only the books.
Posterous, which does everything Evernote does and more. But on the iPad, getting the audio recordings out has proved a bit of a trick. Images are doable as email attachments but audio either is impossible or can be done but file size is limited or needs some special sync tool as in the case of iTalk. So Evernote seems like a cool alternative, though the voice quality is not quite as good.
I wonder how many students know about Jing or about Audacity.