Windows Vista and WinFX February CTP just released!
The February CTP for Windows Vista, Windows SDK (and WinFX) and Orcas technologies such as Cider have been released on the Windows Vista and WinFX Dev Centers.
https://msdn.microsoft.com/windowsvista
https://msdn.microsoft.com/winfx
After working with Windows Communication Foundation for a while I am really looking forward to installing the February CTP of WinFx.
The actual downloads can be found at https://msdn.microsoft.com/windowsvista/getthebeta/default.aspx