Audio
Free Music Archive
Internet Archive - free digital recordings
Partners in Rhyme - royalty free music and sound effects
Podsafe Audio
Soundzabound - music loops (cherokeetrail, trail)
Soundsnap - special effects and music loops
Visual
Every Stock Photo
Flickr CC
Flicker Storm
Creative Commons Search
PicFinder
Pics4Learning
PD Photo
Clip Art (great for Comic Life users)
Barry's Clip Art Server
Discovery Education Clip Art
School Clip Art
Teacher Files