Add link to Andrew's MX arch paper.

doc/guide/introduction.tex

@@ -176,9 +176,12 @@ figure out a problem, and this guide is an attempt to gather up the
 knowledge we've gained so that others don't have to make the same
 mistakes we did while learning.
 
+The author's ZODB project is described in a paper available here,
+\url{http://www.amk.ca/python/writing/mx-architecture/}
+
 This document will always be a work in progress.  If you wish to
 suggest clarifications or additional topics, please send your comments to
-\email{akuchlin@mems-exchange.org}.  
+\email{zodb-dev@zope.org}.
 
 \subsection{Acknowledgements}