The Map of Knowledge is a visualization of the interconnectedness of various scientfic disciplines. From the PloS ONE article:
Over the course of 2007 and 2008, we collected nearly 1 billion user interactions recorded by the scholarly web portals of some of the most significant publishers, aggregators and institutional consortia.
High-quality images of the map.
found via posts by William (Bill) Drew and Robert L. Balliot on the Web4Lib list
