This is under construction. Limit of 100 podcasters displayed for now because otherwise it would just blow. The map is centered on our office which we figured was as good a place as any to start. We'd like to be able to display more podcasts per page (this is limited) and we'd also like to figure out a way to deal with multiple podcasts in the same city (i.e. on top of each other lat/lon wise). We're looking at a slight randomizer that moves people a few hundred yards left or right of the city lat/lon coordinates.
Last Monday, Boingo agreed to send http://wifi-hotspot.wirelessinternetcoverage.com their entire wifi hotspot database. They came through. Since then, the wirelessinternetcoverage.com guys have been working 24/7 to get all the "thousand points of light" in their new Google Maps Hack. It's done.