WatchKnowLearn has indexed approximately 50,000 educational videos, placing them into a directory of over 5,000 categories. The videos are available without any registration or fees to teachers in the classroom, as well as parents and students at home 24/7. Users can dive into our innovative directory or search for videos by subject and age level. Video titles, descriptions, age-level information, and ratings are all edited for usefulness. Our Web site invites broad participation in a new kind of wiki system, guided by teachers. WatchKnowLearn does not itself host videos—we serve as a library for links to excellent educational videos that have been selected by educators.