OneNote And Collaboration

Almost exactly a year ago, I asked whether IBM should be concerned about Microsoft's OneNote product. I continue to hear interesting things about OneNote. Seems to me that Microsoft is looking at OneNote as a collaboration tool. I.e, look at the second to last heading in this article, and the quote within:

Willoughby has found that OneNote is just the ticket for collaborating on team projects. When all research group members use OneNote, the critical peer review process in which students review and comment on each others' work becomes seamless.

Although I don't have a tablet PC, I think I'm going to try it out to see what it offers. Based on things I've read about how it interacts with MS Office, think it's probably an OLE server, so integration with Lotus Notes should be possible.