Great update! A few things though.
1. How about folder operations( move/ rename/ archive) on iPhone/ iPod Touch
3. More robust PDF viewer. Check out Airsharing Pro. The PDF viewer supports large files, table of contents, thumbnails.
4. Perhaps Bookmarklet for Safari to save files into Files
5. Multliple file attachments to email.
Despite some of the features of Airsharing Pro, I think Files is still a better experience. Way to go. Can't wait for Files 2.0
PS- notes would be cool too, though maybe not part of your vision:)