Check out the list (from OneNote co-creator and Office Labs lead Chris Pratley) and replies for some handy OneNote tips
tried to do ten but couldn't stop myself.
15. Send to OneNote printer driver. Print anything to OneNote from any app. PDF, Word, web pages, AutoCAD, whatever! (currently not on 64-bit Windows - bummer)
14. Email these notes button (Ctrl-Shift-E). Click the button in the toolbar, choose recipients, and my notes are distributed without any retyping or hassle. Even sends ink. (you need Outlook 2007 for this to work best)
(See the rest of the list)