The OER Commons exists to help educators "find free-to-use teaching and learning content from around the world." Thousands of primary, secondary and post-secondary activities, labs, lecture notes, assignments and other educational materials are available by searching or browsing the OER site.
WFMU's Free Music Archive, "an online digital library of music that will allow music fans, webcasters and podcasters to listen, download, and stream for free, with no restrictions, registration or fees. And it will all be legal." Still pre-launch, but there's already quite a bit of music available on the site, including a sampler CD.