The World Bank has adopted an Open Access Policy that puts its works under a CC BY 3.0 License.
Here's an excerpt from the press release:
Two years after opening its vast storehouse of data to the public, the World Bank is consolidating more than 2,000 books, articles, reports and research papers in a search-engine friendly Open Knowledge Repository, and allowing the public to distribute, reuse and build upon much of its work—including commercially. . . .
The repository and Creative Commons licenses are part of a new open access policy that takes effect on July 1 and will be phased in over the next year.
Read more about it at "World Bank to Introduce Open Access Policy."