This is a great thread with great info. Thanks for starting it.

It's taken months for microsoft to get with the program...(this open licensing, VLP stuff used to be for oems only) but they have opened it up to value added resellers which is what I am.
Just a minor correction, volume licensing and OEM licensing are and have been two entirely different beasts. I'm a huge fan of volume licensing since it makes keeping track of clients licenses, whether it be operating system, Office products, and other Microsoft offerings, loads easier. Only problem with volume licensing is that it's considerably more expensive than it's OEM or retail versions of the software.