While 3WN loves the Wikipedia, we just now discovered the Wikimedia Commons, "a project that provides a central repository for free images, music, sound & video clips and, possibly, texts and spoken texts, used in pages of any Wikimedia project. Unlike images uploaded on other projects, images on Commons can be embedded on pages of all Wikimedia projects." Wikimedia will be a year old on September 7. I feel so very dumb for not knowing.
If you like what Wikimedia is doing, consider making a donation.