Jeff's Notable Google Earth Placemarks and Topics (hundreds of GEarth links)
[maps] - Astral labyrinths
[maps] - Lunar cartography
Superfuture Maps Major city district-maps for hipsters.
Google Maps Mania - blog
flashearth "See anywhere in the world using satellite images from Google Maps or MSN Virtual Earth."
Gvisit - Visitor log for blanketfort. recognize yourself? shows up to 20 most recent visits. (script will be removed in a few days)
Placeopedia.com - Connecting Wikipedia articles with their locations. another google map hack.
and of course, The Map Room: A Weblog About Maps