WF comes with SqlWorkflowPersistenceService out of the box. But SQL is not always available, or you may just want to try your workflow program with the persistence. I implemented a file based persistence service as attached. Note it does not implement...

.NET Framework 3.0 contains WCF, WPF and WWF. It is shipped ! http://www.microsoft.com/downloads/details.aspx?FamilyId=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en . The Windows SDK for Windows Vista and .NET Framework 3.0 can be downloaded...