Wowza....here's a link to the Insider's Guide to Oaxaca - it's a photo filled post on street art in OAX which totally gives you and idea for the depth and breadth. Last time I was in Oaxaca, I drove through a part of town that was just full of mural after mural. I think we'll have Pablo take us there on the next art tour. Drive by art touring.
photo above courtesy Insider's Guide to Oaxaca