Site Address: http://www.teachersdomain.org
A short while back a Teachers' Domain resource was posted on the UEN Multimedia Blog. That resource is only one of thousands of fabulous sources available on Teachers Domain. The bulk of Teachers Domain resources are things that were generated by or for WGBH in Boston. If you grew up when I did and there were only four channels. You know WGBH. During the summer months it was the only kid friendly programming on during the day.
The Teacher's Domain site is organized by topic which allows you to focus on resources that are relevant to your situation. Most of the resources also explicitly allow permission to be used.
Others allow less permission but are still generous.
The site is a fantastic resource for finding all kinds of useful classroom media and interactives