Newton's Apple - An excellent collection of more than 300 video clips with accompaning text and teachers guides organized by science category. Don't miss the "Try This at Home" section for hands on activities. Produced by Twin Cities Public Television. (http://www.newtonsapple.tv)
Ask Dr. Math - Get the answer to a math question from an expert. Questions and answers are catagorized by grade level and subject and provides teacher services. Produced by Drexel University. (http://mathforum.org/dr.math/dr-math.html)
Nevada Mining Association - A collection of classroom activities to illustrate principles found in geology and earth sciences. Activities range from asphalt cookies to time travel. All activities are in lesson plan format based on NDOE science standards. Maintained by Nevada Mining Association with contributions from teachers. (http://www.nevadamining.org/education/workshops/activities/)
42eXplore - Thematic Pathfinders for all Ages. Multiple links to hundreds of topics in many subjects. Well maintained and easy to access. Sponsored by eduScapes.com. (http://42explore.com/)
Science Spot - An award winning site filled with science projects, information links and classroom activities targeted for middle school. Developed and maintained by Tracy Trimpe. (http://sciencespot.net)
Exploratorium - Located in San Francisco, the Exploratorium offers the best of hands-on activities. The Exploratorium website extends this experience to your classroom. (http://www.exploratorium.edu/)