Windows Workflow Foundation, WF, and WCF

Thot followings might be good resources for .NET 3.5 Workflow, and Workflow as a Service.

MSDN, David Chappell, Introducing Windows Workflow Foundation, Chappell and Associates
http://msdn.microsoft.com/en-us/library/ee210343.aspx

OdeToCode.com, K. Scott Allen: Answers to WF Interview Questions
http://odetocode.com/blogs/scott/archive/2007/10/31/answers-to-wf-interview-questions.aspx

Guy Burstein, Execute Windows Workflow Rules without Workflow
http://blogs.microsoft.co.il/blogs/bursteg/archive/2006/10/11/RuleExecutionWithoutWorkflow.aspx

Guy Burstein, Build workflow rules using Code Dom and Rules API
http://blogs.microsoft.co.il/blogs/bursteg/archive/2006/12/04/RulesWithCodeDom.aspx

MSDN, Learning Workflow Foundation
http://msdn.microsoft.com/en-us/library/ee373755.aspx

MSDN, Selecting Workflow Type
http://msdn.microsoft.com/en-us/library/dd756424.aspx

MSDN, How to Choose Your Workflow Model in WF
http://msdn.microsoft.com/en-us/library/cc768563.aspx

MSDN, Windows Workflow Foundation: Creating a Custom Composite Activity
http://msdn.microsoft.com/en-us/library/dd177566.aspx

MSDN, WF Scenarios Guidance: SharePoint and Workflow
http://msdn.microsoft.com/en-us/library/cc748597.aspx

MSDN, WF Scenarios Guidance: Presentation Flow
http://msdn.microsoft.com/en-us/library/dd557867.aspx

MSDN, WF Scenarios Guidance: Human Workflow
http://msdn.microsoft.com/en-us/library/cc709416.aspx

MSDN, WF Scenarios Guidance: Workflow Services
http://msdn.microsoft.com/en-us/library/cc825354.aspx