I came across a couple of very interesting videos from two different schools using OneNote in the classroom and with faculty. I thought you might enjoy. You really see the power of pen/ink, freeform writing surface, capturing images and media, and shared notes.
https://www.youtube.com/watch?v=yW1NjHoRrAY&hd=1 This is from Whitfield School in St. Louis.
http://countryday.smugmug.com/Other/HANDBRAKE/10944710_tdfbDJ#!i=1790107080&k=kknrpnZ&lb=1&s=A. This one is from Cincinnati Country Day.
It is great to see these educators using OneNote in ways that we designed for, and taking it to new heights.