Khan Academy is a free site containing material and resources for students, teachers or parents. The video library, practice exercises, and assessments are accessible to anyone from any computer with access to the web. The library of over 2600 videos covers K-12 math, science topics such as biology, chemistry, and physics, and even reaches into the humanities with playlists on finance and history. Each video is a digestible chunk, approximately 10 minutes long, and especially purposed for viewing on the computer. This is a goldmine for resources for teacher, self paced learning, targeted interventions and extra help.