Wow its been a great ride helping get Hyper-V to perform the way it does.  So much so I've not posted in a while.  You will see some upcoming posts on performance counters, WMI perf interfaces, and real data (yes now with RTM I can post data).

In the meantime check out my co-workers post on where to get the final (aka RTM) WS08 Hyper-V bits...

http://blogs.technet.com/jhoward/archive/2008/06/26/hyper-v-rtm-announcement-available-today-from-the-microsoft-download-centre.aspx 

   Tony