I took Chris Pratley’s suggestion and played with OneNote’s Publish features, using as a sample last Thursday evening’s fern discovery expedition.  Publish worked great, saving the page in MHTML (a multi-part HTML package with embedded images).  OneNote preserved the layout nicely, which is pretty impressive given HTML’s limitations as a document layout format.

However, MSN Groups serves up the resulting .mht poorly - IE doesn’t seem to recognize the format and display the results correctly.  (I have no idea if other browsers even support this format.)  You can right-click and download the file to your local machine and browse it just fine, but that’s rather inconvenient and raises security suspicions.

The MTHML can be converted to plain old HTML fairly easily in IE by selecting File/Save As…/Web Page Complete.  The resulting multiple files require a bit more work to upload to MSN Groups, but the results actually work (always a good thing.)  Would be nice to have a direct Save As…/Web Page Complete or equivalent in the next version of OneNote.

[Update 14 June: Well, that didn't work as well as I thought.  The simplest "My Documents" option on MSN Groups isn't publicly viewable.  Creating a new group with public permissions still required an MSN account to view - unacceptable for my purposes.  When I moved the files back to my own ISP account, and updated the links in my blogs, I found the Save as/Web Page Complete didn't preserve relative locations, and mangled the names to make direct access through a browser impossible.  Had to do some hand-editing.  Looks like I have to up the priority of my request that OneNote export clean HTML directly.]