I found the 2000 yr old food forest in Morocco Jack mentioned. It is called 'Paradise Valley' by the locals.
http://www.flashtoonz.com/blog/?p=164It can be found on Google Earth (or other mapping software) at
30 deg 33 min 15 sec N
9 deg 33 min 53 Sec W
One thing I notice is the patchwork nature of the 'forest' I pictured large swaths of various trees, not individual blocks. This permaculture stuff is more complicated that I thought!