A couple weeks ago Mike Tholfsen, the OneNote Test Manager, did a LiveMeeting demo for some sale representatives but during his presentation he did an overview of all of OneNote.  If you would like to learn more about OneNote and have an hour to spare I recommend you check out the LiveMeeting video:

Microsoft Office System Webcast: OneNote 2007 Tips and Tricks for Sales Representatives

Sadly there are a bunch of steps you need to follow such as: register online, sign in with your Passport account, choose confirm, view online, enter email & name, then click the media play icon or download it for offline viewing.  BUT once you get through this it is a great presentation!  Thanks for forwarding Mike!