This neat trick came across on an internal alias. I hadn't seen this before, but I'm guessing it isn't new. Pretty handy for notetaking (if you're a plain text sort of guy/gal).
[Update: Evidentally this is explained in KB260563 which makes it look like this feature has been around since Windows 98. Still pretty cool in my book.
I was in a presentation today with Jeff Sanquist and as he was scrolling through his blog on screen saw he picked up on this too.]