Omer, one of our developers here, kicked out a nice little powertoy for OneNote 2010 that lets you see when pages were created in a calendar type of format. He graciously agreed to let me share it here, so I hope you enjoy it as much as I have.
Here's the quick start to it:
Calendar view for OneNote that displays the pages on the date you created or last modified them.
I will also add that this is a standalone tool and you just run the executable to make it display the calendar. Also, I have a very huge number of pages in the 30+ notebooks I have open, so it takes a while to load that large of a data set.
The download is below my signature. Just download it and then unzip the file to get to the EXE.
Edit 11/30/2011: Omer has released this on his own blog at http://www.omeratay.com/onetastic/?r=onecal - jump over there to get it!
Questions, comments, concerns and criticisms always welcome,