Think to a PDF/DOC/movi ebook reader.. like acrobat (or kindle)..
Add up some tricky utilities, like:
- select'n'show image (diagram, map, picture, whatever)
- bookmarks and color/grey highlighting of text (to be shared with friends someway)
- add comments on side margins of the pages (also shareable with selected friends)
The software should work in win and apple IOS, linux, android and iPhone
Nothing really new, but something not yet available in an ebook reader