Minnesota Zoo's interactive flash that lets students discover which animal left with pile of poop. Turns out you can learn a lot about an animal from its poop.
From its humble beginnings as an elementary teacher's classroom website, on through the present, the KidsKnowIt Network has always had one goal, and that is to make learning free. Founded in 1998 in order to provide student's with a fun and educational way to spend their free time, a teacher's classroom project has grown into a worldwide platform attracting several million visitors every single month.
Every website developed is painstakingly researched for accuracy, and appropriateness. This process begins with the planning and development of materials, activities, and articles by parents and educators, and ends with the final editing and approval of experts in the field being explored.
National Geographic Maps: Tools for Adventure is the best everything-map site I have seen. The site was created by the Children's museum of Indianapolis. Maps are presented as the keys to adventure. Students learn to use maps to find their way, share information, look at patterns, and solve problems. There are six excellent interactive games for students to practice putting their math skills to use. Students can explore a pyramid by guiding a robot to hieroglyphs, find sunken treasure, explore Mars, go on an adventure, see GIS in action, and visit Adventure Island. I love the realistic feel of these games, as students explore and guide robots, they get a "live" video feed of where they are navigating. On the National Geographic Maps: Tools for Adventures site, you will find information about the Indianapolis exhibit, how to use maps, related map links, and lesson plans. This is one of those websites that my description just won't do justice to, be sure to check it out!
Vetted case studies with complete lessons and materials. The principle is that by teaching in a case study format, it fosters higher-order thinking with a focus on cooperative, project-based learning strategies. The topics tend to be current and encourage debate. A search filtering by grade level found over 200 lessons for high school.