The Obama transition team released most of its images and text under Creative Commons Attribution 3.0 License. Now this has carried over to the White House as well. Material produced by the federal government, of course, is public domain. But according to the copyright page on the new whitehouse.gov:
Except where otherwise noted, third-party content on this site is licensed under a Creative Commons Attribution 3.0 License. Visitors to this website agree to grant a non-exclusive, irrevocable, royalty-free license to the rest of the world for their submissions to Whitehouse.gov under the Creative Commons Attribution 3.0 License.
Such an endorsement can only be a good thing for the free culture movement.