Edheads helps students learn through educational games and activities designed to meet state and national standards (US). EdTechIdeas: Students can learn about simple and compound machines, how to predict the weather, perform virtual knee surgery, and even create a stem cell line.
Super Teacher tools has a bunch of great teaching tools that allow teachers and students to create games, quizzes, charts and a variety of other useful things for your classroom. The most popular is a Jeopardy Review Game that you can create custom Jeopardy games for your students. EdTechIdeas: I use this site to have my students create review games for other students to play. They must first research a given topic, come up with questions and answers, and then use those facts to create a game
Houghton Mifflin Harcourt's Education Place offers thirty-eight free printable graphic organizers for your classroom use. Included in the roster of graphic organizers are templates for word webs, KWL charts, flow charts, story maps, and idea wheels.
Top Documentary Films is a great site for finding all sorts of documentaries. While not hosting these documentaries, it does provide links to them that are found on Google Video, You Tube etc. Be forewarned that there are topics listed that are not suitable for children - as always, preview and choose from the larger collection before using them.
A great article by Will Richardson about how we need to teach students how to 'brand' themselves on the Internet. While the focus seems to be high school, we can begin that work in elementary.