PDF containing clickable links to numerous applications and sites.
An O'Reilly Radar report published in autumn 2006. It is aimed primarily at web managers and developers, offering advice on bringing new products and services to market.
Report published by the Pew Internet Project in October 2006.
A working paper published in 2005 as part of the scientific programme of Chimera, the Institute for Sociotechnical Innovation and Research at the University of Essex (U.K.). It gives a clear explanation of the evolution and operation of blogs and their significance.