Being in the computer business, I find myself in a lot of meetings with network maps being drawn on the white board that I would love to capture effortlessly to my computer for later retrieval.
What I usually do is hand draw everything and then try to go back to a program like Visio to capture them on my computer.
Not anymore. With ScanR I can just photograph the white board, email them, and have them send me back a PDF of the drawing. Excellent.
I have not yet tried their free service but I hear it is great.