Kinda fun watching this video. As it seems the big new features of the Windows 7 audio stack are the ability to move streams while they are live, to do role-based policy routing, and to pause streams during phone calls. Hah! That's so yesterday! A certain sound server I happen to know very well has been supporting this for a longer time already, and you can even buy that logic in various consumer products.
Nice to know that in some areas of the audio stack it's not us who need to play catch-up with them, but they are the ones who need to play catch-up with us.