Some Windows Workflow resources

WF Developer Center on MSDN – it all starts with the MSDN Dev Center
WF Community Site – tons of samples, walkthroughs, activities, and more!
WF in the .NET Framework 3.0 SDK – WF SDK reference
Cutting Edge: Windows Workflow Foundation, Part 1 – Dino Esposito does it again, with a great article on WF
Cutting Edge: Windows Workflow Foundation, Part 2 – continuation of exploration of WF

Thanks to Ron for links.....