Just completed an overview session for some of our UK partners - and promised to quickly share the links from the session.

Updated to include Nicks links.

Windows Vista RC1 and .NET Framework 3.0 Downloads
My colleague Paul Andrew has a great post with the links: http://blogs.msdn.com/pandrew/archive/2006/09/07/745701.aspx 

Workflow Links
http://msdn.microsoft.com/winfx/technologies/communication/
http://msdn.microsoft.com/workflow 
http://wf.netfx3.com/ 

.NET Framework 3.0
http://www.netfx3.com/

Vista
MSDN Windows Vista Developer Center http://msdn.microsoft.com/windowsvista
Top-10 Ways to Light Up Your Windows Vista Applications http://msdn.microsoft.com/windowsvista/top10 
Preliminary Windows Vista UX Guidelines http://msdn.microsoft.com/windowsvista/experience 
Microsoft Gadgets http://microsoftgadgets.com 
Enterprise Planning Guide for Windows Vista PCs http://www.microsoft.com/technet/windowsvista/evaluate/hardware/vistarpc.mspx  
Using Application Compatibility Tools for Marking Legacy Applications with Elevated Run Levels on Windows Vista http://www.microsoft.com/technet/windowsvista/deploy/appcompat/acshims.mspx
Application Compatibility http://msdn.microsoft.com/windowsvista/reference/appcompat/default.aspx

WPF
MSDN WPF site http://msdn2.microsoft.com/en-us/netframework/aa663326.aspx
Web Casts from Mix06 http://sessions.mix06.com/
Preliminary Windows Vista UX Guidelines http://msdn.microsoft.com/windowsvista/experience 
WPF Community Site (inc samples) http://sessions.mix06.com/
‘5 day course’ for getting up to speed on WPF http://blogs.msdn.com/karstenj/archive/2006/06/15/632639.aspx
Free .Net Framework 3.0 training up until launch http://blogs.msdn.com/karstenj/archive/2006/06/15/632639.aspx