I have been working with the MSDN folks to get the OneNote XML schema reference posted online. You can find them here: 2007 Office System: XML Schema Reference (Beta 2) (same link, but just better for search engines/crawlers: OneNote 2007 Beta2 XML Schema Reference).
Some notes about the OneNote reference:
- It is just a little different from what you saw in Beta2, though they are compatible.
- It is likely to change so make sure whatever apps you write are refreshed in the future.
- What do you think‽ Do you have suggestions or comments?
Please let me know what questions you have about this. Take care!