Not a killer app, but worth checking out:
| Liquid Information
| Welcome to Liquid Information, a research project at UCLiC in
| London in cooperation with Doug Engelbart in California. We are
| aiming to make text more interactive - turning words into
| hyperwords. Why? Most electronic communication has focused on
| the production of information, not the digestion of information.
| In order to make informed decisions in our work, it's not enough
| to rely on automated systems - we need to get the right information
| into our heads.