"SnagLearning is dedicated to presenting high-quality documentary films as educational tools to ignite meaningful discussion within the learning community." A great place to gather information and stimulate discussion. Also links to other respected content sites, such as PBS for Teachers and Discovery Education.
This site is a geat resource for content-based learning for teens and adults. You can browse by categories (right-hand column) for topics in history, nature, people/biography, science, etc. There are no lesson plans or other educational apparatus.