Chandra Sky Map - Joe DePasquale runs through the process of creating the map and some helpful tips for using the interactive tool.
An amazing piece of statistical analysis produced this zoomable (down to the block level) map of energy consumption for New York City, based on Spatial distribution of urban building energy consumption by end use. [via]
Digital Encyclopaedia of the Hellenic World is a three volume, drill down* cornucopia of information (some sections not published yet - but often with hover over info) for you to get lost in. [more inside]