There is a special Oaxacan cultural fair going on now through September 14th, 2008. There are several huge restaurants set up serving all the typical Oaxacan specialties as well as many small stands selling moles, cheeses, chiles etc. and crafts. It is located outside of a big mall, the "Plaza de las Estrellas", at the Circuito Interior and Av. Marina Nacional, not far from Polanco. You can reach it by metro (Normal) as well. Well worth it for the food. We ate there yesterday - all 7 of the famous moles were on the menu!