Pics 4 Learning - Nice Alternative to Google Images

Pics4Learning is a safe, free image library for education. Teachers and students can use the copyright-friendly photos and images for classrooms, multimedia projects, web sites, videos, portfolios, or any other project in an educational setting.
The thousands of photos in this collection are approved for use in the classroom and indexed and sorted in order to maximize their effective use by students in a 21st century classroom.

Soungle - The Google of free Audio effects and Samples

Free searchable database of hundreds of downloadable special effects and musical instrument samples.  I have used this with my own kids for a few tasks and it has tens of thousands of useful audio samples.