This came under my attention via the official CC blog: "The ABC, Australia's national public broadcaster, just launched a CC-friendly social media space, Pool, which is designed to provide a "place for creative content makers to upload their work, publish and collaborate". Pool offers users the ability to upload their content - whatever the medium - under the full suite of CC licences (as well as All Rights Reserved) for other users to reuse and share."
So, this public broadcaster gives a good example of keeping public content open for the public. But i'm afraid there is still a lot of work to do: public broadcasters have to put all their content in the public, because they are being paid by the tax payers. So, all content must be given back to the people who funded it, not by selling it, but by putting it on the internet with an open license. Compare it with open source in governmental institutions.