I noticed this earlier today and have just finished listening to it - Mike Neil, Jim Ni and Jeff Woolsey from the Windows Virtualisation Product Group have been interviewd by Charles Torre about what the current products are (ie Virtual PC, Virtual Server), how they work architecturally including things such as ring compression and how VT/Pacifica hardware assistance will help with the next version of Virtual Server 2005 R2 and Windows Virtualisation in Longhorn Server plus lots more. It's worth taking an hour out to take a look whether you're a "newbie" or veteran to virtualisation.

Channel 9 article link