I've been working quite a bit recently on the OneNote Printer. I had a bug reported with my automation script (I was checking to see if the printout had been inserted much too soon – the fix was to wait until the printout was imported correctly), looking into some other automation problems and had been putting together a quick "how to" for folks that get the OneNote printer set to be the default.
It turns out that Michael Oldenburg beat me to the punch. He put up a really good guide for what to do if the ON printer winds up as the default and how to fix this. It's here: http://blogs.office.com/b/microsoft-onenote/archive/2011/04/25/is-microsoft-onenote-hijacking-your-print-jobs.aspx . If you haven't read through this and are interested, please jump over and check it out. There is a lot of good background information there, screenshots for how to change the default printer and some reasons why this could be happening.
Thanks a lot, Michael! Saved me a bunch of time.
Questions, comments, concerns and criticisms always welcome, John