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[tom <tom AT honeychrome.com>]

There is an interesting article about research on polyclutures with  
black walnut trees in the current issue of the Permaculture  
Activist.  I only gave it a quick skim, but the research covers  
something like 35 years and discusses what can do well in walnut  
proximity during different stages of the tree's life.  Apparently the  
article is a synopsis of a paper that is available ($, of course)  
here: http://www.springerlink.com/content/n5k623313463t5n6/