Yeah, I would say its something a lot like the new Google Wave that they announced a while back. NotoAir is note-taking software first and a collaboration tool second. First, you use NotoAir to take notes, stuff for like classes, etc. Then, if the note isn't personal you can make it public. So if I where taking a note for a class... I wouldn't have any good reason to keep that only to myself - so I could let other people see my notes. The application (the Air app) started as a simple html/wiki based note taking application that I decided to see if I could turn into an service and maybe eventually a product.
I really appreciate the feedback! I am trying to get together a screencast, but have been working on the code right now. I did overlook the email address issue and really intend to just use a username and not an email address.
To answer some of your other questions, the main page is your "start" page that you can edit and and then add links to new pages in the same way that you do on a wiki; the link will link to a blank page until you edit it.
The concept is that you can store the pages and make them public if you want to share.
I agree there is still more polish that I can and will add, and I'll fix the email address issue!