The IDIOM Media Watch on Climate Change aggregates web content from 150 sources, accessible in the form of semantic maps, on which the topology of the Earth is redrawn as mountains and valleys according to the density of available information, or a three-dimensional 'knowledge planet' viewable in NASA World Wind. [Via Information Aesthetics.]
The Bio Mapping tool allows the wearer to record their Galvanic Skin Response, which is a simple indicator of emotional arousal, in conjunction with their geographical location. By sharing this data we can construct maps that visualise where we as a community feel stressed and excited.
Mapping Medieval Townscapes: a digital atlas of the new towns of Edward I For each town you will find maps and images, as well as historical interpretation, bibliographical information, and access through to a geographical database. (The fancy interactive maps are especially good.) Warning: you'll have to click to agree to some terms and conditions before you can view the site.