FYI, I have uploaded an updated code sample to the Patches section of this site.
The update is here...
The description is here...
The file "Northwind01_T4Sample_200911051153.zip" is an update. It contains a fully-implemented, end-to-end sample. It shows one way to use T4 templates and the T4 ToolBox http://www.codeplex.com/t4toolbox/ and the Linq To Sql Entity Base http://www.codeplex.com/LINQ2SQLEB/
and a Repository design pattern. It is a simple proof-of-concept web site.
-- Mark Kamoski