I've recently had to change the workshop series on Integrating Workflow into your .NET Applications for .NET 3.0 download location. They are still freely downloadable.
This series of workshops are filled with:
Links to downloads
Part 1 - Introduction to building workflow's with Microsoft Windows Workflow Foundation (.NET 3.0)
Part 2 - How to build custom Workflow Activities with Microsoft Windows Workflow Foundation (.NET 3.0)
Sample Page from the workshop document:
~ Robert Shelton