Radical Cartography is not so much radical as it is interesting. There are a number of interesting maps on this site, including a flash map of the development of telephone area codes in the United States, a comparison of projections of South America, a scale comparison of North American subway networks, and a map of North and South America showing place name etymologies. As well, there are a number of links to interesting resources, some of which are dead (including the Starbucks Avoidance Map - has anyone seen this?). Worth spending some time visiting.