Critical Chain again

This term's course includes the Critical Chain topic. So I'm looking around for more references and examples to illustrate the principles. This link is interesting for putting the emphasis on estimating, understanding and managing variation. Tony Rizzo, the author, goes on to examine the use of Critical Chain in a multi-project environment.
Another interesting observation is that the mainstream Project Management products do not support the approach.
The Project Management Soap Box: [17] The Critical Chain Model