videos
WatchKnow.com: Videos for kids to learn from
Watchknow.com is a site that allows you to search for educational videos by age range and keywords. The videos are submitted, tagged and rated by users, the videos themselves are from other sites across the web. I would be tempted to prescreen any unranked videos before sharing them with young kids.
BBC Primary School Languages: French, Spanish & Welsh
The BBC has fun resources to help elementary aged kids learn French, Spanish and Welsh. These are the first free resources I've found that go beyond the absolute basics (i.e. colors, numbers, and a couple phrases) while remaining fun and appropriate for younger kids.
Khan Academy- a goldmine of free math, science and economics videos
Khan academy is an amazing resource. It's a HUGE collection of videos, all featuring a smart man with a gift for clearly explaining the complex, carefully going through a wide range of topics, all clearly organized. There's everything from classic brain teasers, to arithmetic, to high school level math, including calculus and differential equations, to biology chemistry, physics, and economics. The graphics in the videos are fairly simple, and the tone is very friendly, conversational and often funny.
National Geographic Kids
Animals, Games, Activities, Videos, Stories, People and Places, and Photos.
Animal Planet
pet guides, games, blogs, the spot, video, blogs, roar, newsletters, wild animals.