I did a session for Staff on our Staff Development day on the use of Moodle. To assist staff work with OneNote I prepared notes using OneNote as well as a basic PowerPoint on the topic.
Hopefully I can upload the file here.

Earlier I had my year 9 IST class spend some time playing with OneNote and then asked them to come up with uses for the program in class.
The brainstorm I set up using Inspiration: is now a jpg file - sorry can't get better resolution on this page