Creative Commons is an organization that helps individuals share and remix their songs, videos, writings, etc. under appropriate licenses. Need a picture for a blog posting? Search Flickr, Google, Yahoo, all of which now have Creative Commons search options. With a CC license, you know ahead of time which rights you have. Don’t forget to give credit to the original creator, and consider sharing your work under a CC license, too.
As a non-profit, Creative Commons needs support from lots of individual folks who believe that there is a large reasonable middle ground between locked-down copyright and public domain. If you can, contribute to Creative Commons:
(Disclaimer: I’ve been helping Creative Commons with tech issues since 2002.)
UPDATE: In the comments, I’ve added pointers to Google, Yahoo, and Flickr’s Creative Commons search pages.