Measuring the Commons
The commons is clearly important, but it's hard to get a handle on just how big it is these days. So the release of some figures from the Creative Commons project, detailing how many of which kind of licence has been adopted, makes fascinating reading.
It also has some useful links: to more licence statistics, and to "curators" of Creative Commons material, complete with figures showing the size of their respective holdings. Interesting to see that Flickr towers over everyone.