the sample is published at http://wf.netfx3.com/files/folders/sample_applications/entry4074.aspx
A blog entry with details is located at http://blogs.msdn.com/sergeychub/archive/2006/07/06/658342.aspx
Please note it requires the latest .Net 3.0 June CTP and would not work on WF Beta 2.2.

A screencast that demostrates usage of the Windows Workflow Manager is available at Channel 9
jme23
Here is the link: http://channel9.msdn.com/Showpost.aspx postid=213220.
Also, there is a short architectural overview posted at http://blogs.msdn.com/sergeychub/.