This audio archive focuses on Creative Commons music. A quote "This is a community music site featuring remixes licensed under Creative Commons, where you can listen to, sample, mash-up, or interact with music in whatever way you want."
PSA project site that outlines how to create a PSA step by step for students. Includes planning, storyboard, filming, audio, editing and publishing tips.
Soundsnap is great for short, easily searchable clips. A quote from the website "Soundsnap is the best platform to find and share free sound effects and loops- legally. It is a collection of original sounds made or recorded by its users, and not songs or sound FX found on commercial libraries or sample CD's."