It is a pretty cool site where you can easily find software and download it right there. Also right now they have a 20% discount on a bunch of software packages, please see here: 20% off 20 of the hottest game downloads. The list includes these games Oblivion, WoW, EverQuest II as well as a bunch more. If you were thinking about getting these games you should do so now with a 20% discount!
Now if you search for OneNote on Windows Marketplace you only see a few items (only one addin download), I would love to see you all fix this by making software that works up there. Make a OneNote Mobile sync with Palm or a Send to OneNote from Lotus Notes, there are plenty of ideas.