Via Seed:

Picture this: the whole of human knowledge as a figurative mind that can selectively focus on certain areas. It’s a profound notion, and visualizing such a construct is an enormous undertaking. But with last week’s release of a new “map of science,” a team of researchers led by Johan Bollen is attempting to do just that — with a high-resolution visualization of how scientific literature is accessed based on users’ downloading and browsing behavior, known as clickstream data. This usage data was collected, aggregated, and normalized across a wide variety of journal publishers and institutions. The result is a network map with color-coded nodes (clusters of research articles from different fields) and interconnected lines (shaped by users’ clickstreams), demonstrating the connections among a comprehensive sample space of scholarly research.

I can’t find links to the actual work, which would be useful. But MESUR is available.