John's blog post describes free-as-in-beer training materials you can download and reuse with your users, including an intranet SharePoint site so users can self-serve. These are based on the materials Microsoft IT provides to Microsoft employees.

http://blogs.technet.com/john_westworth/archive/2008/10/08/everyday-productivity-education-epe.aspx

The zip download file contains a model of the intranet site for your own use with editable content in the EPE Docs folder. When you customize the documents, the HTML model will link automatically to the guides updated to fit your environment.