A very early, and somewhat incomplete version of my paper is available at http://www.ebt.com:8080/. This is subject to large changes in the future, though the core concepts and explanations are there. Please take the document with a pound of salt ;-) I will be updating the document, and would appreciate constructive advice or critisism. Let's try to avoid "heated discussions" this time ;-) --- Gavin Nicol, EBT