OneNote, the Chameleon
Let's recap. Architecturally and functionally, OneNote 2010 can be considered a distributed collaborative hypertext journaling system. In conjunction with services such as SkyDrive and SharePoint, this system is robustly useful for a wide range of content- and collaboration-focused usage scenarios. If all you need is a simple but effective note-taking application, OneNote is still a great choice, as it's something of a chameleon: You can start with the note-taking features; later, as appropriate, you can explore the more elaborate content-distribution and collaboration capabilities.