Sites for Free Videos, Music and Sounds

Video:
Prelinger Archives
Stock Footage For Free
http://www.detonationfilms.com/free_stuff.htm (explosions and pyrotechnics)
http://commons.wikimedia.org/wiki/Category:Video
http://video.google.com/nara.html
http://www.footagefirm.com/freeclips.asp

Music:
mobygratis.com
http://www.stonewashed.net/free-music.html
http://www.freeplaymusic.com
http://www.mfiles.co.uk/index.htm
http://www.royaltyfreemusic.com/free.html#sfx
http://incompetech.com/m/c/royalty-free/
http://www.jimmyg.us/
http://www.jmtr.com/jmtr-royalty-free.html
http://www.mutopiaproject.org/
http://www.musopen.com/
http://www.publicdomain4u.com/

Sounds:
The Freesound Project
http://www.soundsnap.com/
http://www.stonewashed.net/sfx.html
http://www.a1freesoundeffects.com/
http://www.pacdv.com/sounds/index.html
http://www.grsites.com/sounds/
http://www.flyinghands.com/cat-free_music_clips.html