Creative Commons Licences
For example, everything in the articles section is now licensed under a liberal Creative Commons Attribution licence. The default, old style copyright applied to these pages would prevent anyone from doing anything useful with the content!
Additionally, the (cc) link at the bottom of these pages is consistent with the Microformat Licence Specification, making it easier for search engines and other robots to understand how the content is licensed. In turn, this means that content should become visible in Creative Commons Searches.