This is one of the true supersites for education. Take the time to learn how to use this site, you will be very impressed.
http://www.sciencenetlinks.com/ Providing a wealth of lessons, tools, and resources for K-12 science educators, Science NetLinks is your guide to meaningful standards-based Internet experiences for students.
This is such a large website, it would take a long, long time to go through all the great learning items. Take a little time to learn your way around this important educational website.
http://thinkfinity.org/ Gigantic Website…Thousands of Free Lesson Plans in Math Social Studies Art Language Arts