I love everything about OneNote. I even had pens made saying "I love OneNote".
But I'm not the only show in town. There are some excellent resources surrounding Microsoft OneNote. These are my favorites.
Onetastic for Microsoft OneNote - an amazing collection of free addin's for OneNote 2010 and 2013. I use these daily. Addins include Sorting, Table of Contents, Calendar, and Image editing to name just a few. This is a must-have for all OneNote users.