Who doesn't love maps? Via Gadling, here's the first blog I've ever seen dedicated entirely to the cartographic world:
The Map Room is all about finding maps, map collections, map-related resources, and material about maps on the web. Anything that fits under that rubric, from medieval mappæ mundi to satellite imagery, and from topo maps to Tolkien, is fair game.
The site does have the puzzling URL of http://www.mcwetboy.net/maproom/, but we'll let that pass. They linked to the second blog I've ever seen concerning maps, where there's a cool entry about map tattoos.
DarrenBarefoot.com 
Ummm, as a mapping guy, here’s another one for you… and Canadian! This entry even talks about blogging and cartography!
http://ccablog.blogspot.com/2006/04/cartography-is-one-year-old.html
Another interesting map site. A US ski mash up:
http://www.flexmappers.com/arkade