Public Domain Media
Lest it be said that I just sit around thinking up ways to break copyright, here are two wonderful resources posted this week on Rule the Web, a immensely informative new blog from Mark Frauenfelder of BoingBoing.
Publicdomain4u.com has about a hundred old folk and blues standards (Robert Johnson, Uncle Dave Macon, etc) available for free download.
Morguefile.com a searchable index of very good copyright-free images.
I can not make any guarantees as to the suitability of content for students on these sites (blues lyrics can be pretty racy!) but I did some of my typical smut-magnet test image searches and was relieved to find good, G-rated material. (Try hot girls and you actually get photos of kids at the beach, appropriately dressed. Always a good sign with search engines.)