If you haven't had a chance to check out the MSDN Windows Vista Developer Center then see out http://msdn.microsoft.com/windowsvista, it's probably a 15 minute read to get a flavour of what to expect in the next version of Windows but for now here is a quick summary of new names...

Not too surprisingly "Windows Presentation Foundation" and "Windows Communication Foundation" have both gone to Beta 1 as well and you can download and run these components on Windows XP SP2 and Windows Server 2003 SP1.  Check out Microsoft® WinFX ™ Software Development Kit for Microsoft® Pre-Release Windows Operating System Code-Named "Longhorn", Beta 1 Web Setup