TechNet edge has a good new video chat with the PM for NAP and the Microsoft IT guy who ran all of Microsoft;s internal deployment (ww) on 2 NAP servers! It's a little over 33 mins long - which is longer than many of the vids. Check it out at: http://edge.technet.com/Media/Network-Access-Protection-with-Microsofts-IT/. Stars: Jeff Sigman (the one with the anime hair) from the NAP team and Brent Atkison from MSIT. The notes state:

 "Microsoft turned reporting and deferred enforcement on 120,000 machines worldwide, using a very small number of servers. Very small. Less than 3. Total help desk calls as a result? Also a very small number. Oh, and he did that deployment using beta builds of Longhorn Server 2008.
(this video was originally posted to Channel9 back before Edge existed, but since it's really IT content, not dev, I wanted to put it up over where it belongs)"