Ilya created the OneNote OM Spy tool back in 2007.  Here it is updated for OneNote 2010.  It works much like the original, so I don’t think I need to post a new image or anything like that.  There is one change - you can choose which schema you want to use with the dropdown along the top of the window:

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As usual, the download link is below my signature at the end of this entry.  And the documentation for the schema for 2010 is here.

(For what it is worth, I never understood why it was called OMSpy - the "m" is a mystery to me).

Questions, comments, concerns and criticisms always welcome,

John