The Future of Books[Vimeo]
It would be so easy to link this to all the various social online services or create local networks or frieds networks for, say, book discussions or research.
If you could quickly jump to sources, imagine how much faster it would be to study, experiment and publish? Imagine how much funnier Ann Coulter would be if you could easily read the studies she cites?
You could say I'm excited by the possibilities in these video. :)