One of my favourite mouse features is a thing we have called "riffle" and you would riffle through pages. This is just like you would do with paper you would riffle or quickly flip through the pages in a section (or in the paper metaphor in a notebook).
How do I riffle you might ask? If you are running OneNote 2003 you can do this just by clicking on a page tab and holding down the mouse button and as you move up and down through the page list it will automatically take your through the page listings. If you are using OneNote 2007 you would want to click and hold the ALT key and use the wheel mouse. The reason for the change was because we now have drag and drop so we wanted to enable you to still do this. I personally love holding down alt and using the mouse wheel to quickly go through all of the pages.
That is all I need sometimes, just to see part of my note and then I know what it was I was looking for. It is amazing how a small visual clue could give you that much but just seeing some of the note will clue you in. Actually there was a research done with Microsoft Research that talks about this: Peripheral Display of Digital Handwritten Notes. Done by Gary Hsieh from CMU & Ken Wood & Abigail Sellen from MSR - Cambridge. Pretty interesting read, hopefully they get something working with OneNote instead of just Journal : )
Edited @ 7/19/2006 11:59 AM because of a correction, thanks Alberto!