Web usage data outline map of knowledge:
When users click from one page to another while looking through online scientific journals, they generate a chain of connections between things they think belong together. Now a billion such ‘clickstream events’ have been analysed by researchers to map these connections on a grand scale.
The work provides a fascinating snapshot of the web of interconnections between disciplines, which some data-mining experts believe reveals the degree to which work that is not often cited — including work in the social sciences and humanities — is widely consulted and can form bridges between scientific disciplines…
You can see the amazing network (Fig.5) here
A Blog Around The Clock 
Don’t let me forget to blog about this, once I can take a break from generating colourful networks of my own.