OneNote File Format Reverse Engineered for PowerToy Competition?

I’d like to enter the OneNote PowerToy competition and, since getting a fourth Tablet PC is not particularly motivating I’ll even tell you what I’ve got — your voice notes on your Smartphone / PocketPC get automatically changed into OneNote items. I’ve got it working using file links but I’d like to add note flags and embed the link a la native OneNote recording, though, and you can’t do that with the XML import API. Has anyone reverse-engineered the .one file format at the hex level? You know, like we did when we were kids?

Anyone interested in a little Open Source cooperation?