Chris Pratley's OneNote Blog : OneNote 2007 and Outlook: Best Buddies: "From the beginning of OneNote we've had a lot of requests to deepen our integration with Outlook. In 2003 we had several connection points: you could email notes directly from OneNote if you had Outlook 2003, and you could create tasks from OneNote items. With SP1 of OneNote 2003 we added more Outlook integration features, such as 'Insert Meeting Details', and the ability to create Outlook Appointments and Contacts.
When we did 2007 planning, it was clear from our user surveys that anything we could do to integrate better with Outlook would be most welcome. So here it is, my long-awaited post on all the great things OneNote can do with Outlook (and some additional goodies at the end).
First let me says that unless noted otherwise, all the features below work with Outlook 2003 and Outlook 2007. Some features may also work with older versions of Outlook but we don't support that. And a couple of things work with any mail program as noted below."
Read the full post for details and screen shots.