Well, The Zone has obviously been working for Dave.  He has been Zoning for a few months now. 

Robb Wolf is starting to do a nutrition seminar through the CrossFit affiliate system.  He is going to be focusing on performance based Zone and Paleo nutrition. 

Robb is quite versed in the nutritional field and has a long list of qualifications under his belt.  Robb has written a couple of books and was the 4th CrossFit affiliate.  Go here for info on the seminar.  Lets hope for one here in ATL soon!