From David's blog :
A couple of weeks ago David Chappell wrote a white paper "Introducing the .NET Framework 3.0" which is available from MSDN. Today I found another of David's white papers. One on "Understanding Workflow in Windows SharePoint Services and the 2007 Microsoft Office System".
Windows Workflow Foundation (WF) and Windows SharePoint Services are useful on their own. They become even more useful when you have the ability to create human workflow applications on the document-oriented features of Windows SharePoint Services. Windows SharePoint Services version 3 makes this possible.
Table of Contents:
The Value of Human Workflow
Workflow and Windows SharePoint Services Version 3
Workflow and Office SharePoint Server 2007
Making a Technology Choice
And I can also recommend going through the ECM starter kit workflows to see how it really works! You can download it from Microsoft