Windows 2008 R2 AD
Dmitry has blogged about the new features in Windows 2008 R2 AD - http://dmitrysotnikov.wordpress.com/2008/11/04/server-2008-r2-active-directory/ - especially the PowerShell support. I will be attending the repeat session later in the week and will post my comments on the session at that time.
Read the complete post at http://richardsiddaway.spaces.live.com/Blog/cns!43CFA46A74CF3E96!1854.entry