Jerry,

I forgot to mention a setup step.  You'll need this in .emacs to  
register LaTeX as a source language in org-babel.

(org-babel-add-interpreter "latex")
(add-to-list 'org-babel-tangle-langs '("latex" "tex"))

HTH,
Tom

Thomas S. Dye, Ph.D.
T. S. Dye & Colleagues, Archaeologists, Inc.
Phone: (808) 529-0866 Fax: (808) 529-0884
http://www.tsdye.com