Rhino.Mocks basics - I just threw this together real quick; personal reference material
http://house9-code-samples.blogspot.com/2008/02/rhinomocks-basics.html

The official Rhino Mocks Documentation is very good and available here
http://www.ayende.com/Wiki/(S(33lpuuuz4itdtnjwlncidy55))/Default.aspx?Page=Rhino+Mocks+Documentation