I have often seen comments regarding installing OneNote, from the Windows Store, and always thought why would I do that? I have the full application on the Surface RT.
Well simply as it is awesome, the interface has been streamlines, the notebooks, sections and pages are located on the left but by using full screen (swipe up to access option) and by using the new radial menu you have quick access to options. This is accessed by whenever you add information and see a small circular icon.
Check out this video for a quick overview: http://youtu.be/ghyBo1FgBVw?t=1m48s