Robin Good: DisplayNote is an cross-platform app which allows a presenter to share (over WiFi) his presentation live to his audience, by allowing them to capture, view, edit and contribute to it in real-time fom whichever device they use.
Key features include:
Capture - Capture the presenter's notes, slides, images and video in real-time and all on your own device.
Annotate- Highlight what is important to you, underline key phrases, mark / tag important items for later review, and send annotations to other connected devices.
Collaborate- Work together in groups of any size and on any device. Share annotations with the presenter and other connected devices. Create and join groups for collaborative learning.
Note Taking- Add written notes, post-its and references to any slide, image and video.
Display Control- In presenter mode, use your tablet device to present from anywhere in the room, access and control your desktop, create collaborative groups, pass control to other participant's devices and even view the screen of another connected device.
Private messaging- Send and receive private messages with the presenter and other connected devices while you work.
Any Device, any Platform - Works on any device (smartphone, tablet, laptop etc.) and across all the major platforms including iOS, Android, Windows, Mac OS and Linux.
More info: http://www.displaynote.com/