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. The Web site invites broad participation in a new kind of wiki system, guided by teachers. WatchKnowLearn does not itself host videos—it serves as a library for links to excellent educational videos that have been selected by educators.