As of February 2009, I have joined the School of Computing of the Robert Gordon University. Please visit my new page at : http://www.comp.rgu.ac.uk/staff/hg
In addition to my previous experience at UAM-Iztapalapa, I have enjoyed tutoring Computer Architecture at the University of Edinburgh in 2004,2005 & 2006. The module page can be found here , and the textbook Computer Architecture: A Quantitative Approach, 4th Edition by John L. Hennessy and David A. Patterson is worth purchasing it. You may want to take a look at the additional resources for the book and the Dave Patterson's page in Berkeley