One of my favorite uses of One Note is to plan curriculum units.  When I first start planning a unit, I use One Note to keep up with everything.

I usually start with an outline of what I want to teach.  Then I start gathering resources, usually web resources, since I am usually teaching computer topics.

I’ll flesh everything out, and when I’m done, I can send the finished material to format I wish:  PDF, Microsoft Word, Powerpoint. 

My “finished” One Note notebook easily becomes a handout for participants.  And best yet, I could even send the Notebook itself to my students.