Openness is a virtue
This is a bit of a rant. Bear with me.
We are working on a whiteboard capture and retrieval project (more blogging on this later). The goal is to capture whiteboard images in some unobtrusive manner and then store and index them for future retrieval and browsing. We currently capture with a video camera, but thought it would be good to be agnostic with respect to the source of capture.
mimio makes a whiteboard ink capture tool that uses an IR receiver to track positions of pens on the whiteboard. You still use the same dry-erase markers, but house them in an IR-transmitting enclosure. We thought that would be perfect to tell us when and where inking was taking place.