A useful snapshot – my current favorite in the top-ten list:
Stay on top of changes to group projects.
When you work with multiple users on a shared notebook, automatic highlighting in OneNote 2010 provides you with a distinct view of changes since you last opened the notebook. Additionally, the new page versions feature provides a version history by date and author. If someone changes content inadvertently, just click to restore a previous version of the page. As with all of your shared notebook edits, changes sync automatically when you are online.