K-12: Multi-subject: BrainPOP

http://www.brainpop.com/ BrainPOP, Glencoe/McGraw Hill

Contains more than 400 animated videos for K-12 kids on subjects ranging from the avian flu to the Harlem Renaissance to graphing linear equations. Areas include Science, English, Math, Social Studies, Health and Technology. This is a subscription site (with subscriptions for schools, labs and families), but there are several of the areas that are free to try. Done very well, and could be useful for ESL students since the videos are spoken clearly and slowly enough to understand. Worth a peek.