This site has a large collection of resources for about upper elementary to jr. high levels. There are internet hunts, project-based resources, puzzles, worksheets, and more. Subject matter is mostly history and science topics.
This site from the University of California has a large collection of free resources for learning
A resource from the Smithsonian with news articles and lots of teacher tools.
This is a great little website with printable paper dolls.
This company offers curriculum in Math, Language Arts and History.
Complete math curriculum for grades K through 8.
This site is part of "gamification" trend in education, using the World of Warcraft game as the b