Vista Beta 1 (formerly code named "Longhorn Beta 1) is ready for download from MSDN Subscriber downloads!!!  

Also check out the nice looking Windows Vista developer centre on MSDN:

 http://msdn.microsoft.com/windowsvista/about/

ITPro's also have a new Technet site for Windows Vista:

http://www.microsoft.com/technet/windowsvista/default.mspx

It also looks like we're saying goodbye to "Indigo" and "Avalon". Indigo is "Windows Communication Foundation" and Avalon is "Windows Presentation Foundation".

FYI, You can subscribe to newly published MSDN subscriber downloads here:

http://msdn.microsoft.com/subscriptions/rss.xml