PDC Longhorn & Whidbey hands-on labs available for download...
This info is already available for a long time, but didn't know it! Might be useful if you want to do some experimenting.
PDC Longhorn hands-on labs: http://www.microsoft.com/downloads/details.aspx?FamilyID=d573714a-2b6b-4187-a64c-3d408893b9b1&DisplayLang=en
PDC Whidbey hands-on labs: http://www.microsoft.com/downloads/details.aspx?FamilyID=2567f00f-09a4-4c72-8b23-72f51317e694&DisplayLang=en
Longhorn seems to be available now for MSDN subsscribers... didn't check it out yet.
All presentations of the PDC can be found at http://microsoft.sitestream.com/PDC2003/Default.htm