Zimmerman on OneNote
Fred Zimmerman has written a terrific book about OneNote. On his Zimmerblog site (a member of the OfficeZealot.com community), he has a OneNote InfoCenter section and even offers a few sample chapters in PDF format to give you the flavor of his book.
Fred was quite active in the OneNote Beta discussion groups and helped answer a lot of questions for people new to the program while researching the book.
If you already use OneNote, I recommend taking a look at the sample chapter "Not Your Father's Keyboard Shortcuts". If you've been thinking about giving OneNote a try, start with "Front Matter, Foreword, Introduction". You'll get a real flavor for Fred's writing style and the program.
Note: you must have Adobe Acrobat or Adobe Reader installed to view the sample chapters.
You can download a trial copy of OneNote from Microsoft to take a test drive.