I’ve posted a multiple times about various ways to view contour lines in Google Maps and Google Earth. Now comes EarthTools, a new Google Maps mashup that adds a contour overlay (see image at left). Various parts of the world can be seen at different zoom levels, with more detail and coverage being added over time. Unlike some other mashups attempting this, the contour data in EarthTools loads fast. Right now it only works in FireFox and the IE7 beta. Via Google Maps Mania.