This looks great! Minor nits: In what way is this an OS? Also in the US, Airborn (e.g. to be in the air) is spelled "Airborne" and it's difficult to type it without the trailing 'e' without spellcheck fixing it automagically.
1. It has a Window Manager (try it out in the demo, you can drag around windows and such)
2. It has a File System, which does encryption and compression. This makes it so that the "apps" (documents and presentations, and in the future hopefully spreadsheets) don't have to know anything about encryption. This made it very easy to port the presentations app, for example.
3. It has a Marketplace with apps (not that they are very useful).
But yeah, since many people don't seem to like the name nor the OS-like UI, I'm considering dropping both. I'm just a bit concerned because there are many other companies named simply Airborne or Airborn. Also, integrating documents and presentations into a more unified UI would be a lot of work, since they're pretty much standalone apps today.