View Larger Map
(If that works the way it's supposed to, you should see a map of the world with a number of locations tagged.)
I haven't found locations for every comic I read just yet, but I think this provides a decent sampling. You'll notice, obviously, a strong bias towards American comics, which I find a little disappointing. I was hoping to discover through this effort that I read more international comics than I realized.
The map is freely available through Google Maps, and I plan on continuing to update as I find more information. I'd also like to go back through and add links to all of the actual comics themselves.