Anthony Watkins
Anthony Watkins has written a 5 part series going over the architecture of the example code:
http://www.angleofsight.com/2010/02/google-wave-federation-part-1/
http://www.angleofsight.com/2010/02/google-wave-federation-part-2/
http://www.angleofsight.com/2010/02/google-wave-federation-part-3/
http://www.angleofsight.com/2010/02/google-wave-federation-part-4/
http://www.angleofsight.com/2010/02/google-wave-federation-part-5/
Bryce
http://blog.wavenz.com/2009/07/introduction-to-operational.html
http://blog.wavenz.com/2009/07/operational-transformation-algorithm.html
http://blog.wavenz.com/2009/07/operational-transformation-and.html
http://blog.wavenz.com/2009/07/operational-transformation-and_19.html