PBS Teachers

PBS Teachers is a great site for teachers. Here's what it says about itself:
PBS Teachers is PBS' national web destination for high-quality preK-12 educational resources. Here you'll find classroom materials suitable for a wide range of subjects and grade levels. We provide thousands of lesson plans, teaching activities, on-demand video assets, and interactive games and simulations. These resources are correlated to state and national educational standards and are tied to PBS' award-winning on-air and online programming like NOVA, Nature, Cyberchase, Between the Lions and more.
Local Resources & Services
PBS Teachers is also the gateway for local resources and services offered by your local PBS station. By localizing this website to your local PBS station, you gain access to educational resources, programs, TV schedules and more.