Hot on the heels of Windows Vista RC1, we have now released the August 2006 Community Technology Preview (CTP)of Windows Server "Longhorn". It's available for MSDN and TechNet subscribers to download.
Marked as Build 5560, the August 2006 CTP is an update to Windows Server "Longhorn" Beta 2. You won't find many additional features over Beta 2, but there are big gains in performance and reliability as we've been able to bake in all the core OS improvements that were happening simultaneously in Windows Vista [as well as fix a bunch of our own bugs ;-)].
Go get it now and let us know what you think!