I just received my May 2011 copy of "Phoenix Magazine". What a terrific issue! They have a featured section, "Ultimate Mexican Food Guide". It's 25 pages of Mexican foods including restaurants, bakeries, local products, where to shop, equilas, hardcore cuisine, horchatas, aguas frescas, raspados, paletas etc, etc, etc. The photography is fantastic!
Here's a link to the on-line magazine but it only shows a partial part of the section but enjoy what's here. http://www.phoenixmag.com/