You can check out the Crossfit Journal issue #21 for some basic idea behind the program as well as a block chart which comes in handy. Of course, there's a good block chart here on the FAQ. The book "Mastering The Zone" seems to have all of the info that you'd need as far as implementation of the Zone, figuring out your protein prescription as well as daily meal plans and recipes, etc.

You might also check out Dr. Sears' website and forum here: http://www.drsears.com/welcome.page