The latest Windows SDK is now available for installation as an ISO download. The SDK release supports:
and is compatible with the RTM release of Microsoft® Visual Studio 2005 SP1 (including Express Editions).
I did chuckle slightly when I went into the documentation and decided to filter the contents by "New in Windows Server" .... :-) I promise you - there is plenty of new stuff including IIS7, Framework 3.5 and MSMQ 4.0.