Khan Academy Site looks excellent as far as I can see its a not for profit organisation providing free educational resources and it looks like you can earn badges and points for use or just research - not sure what age its aimed at but sure it will be som
Links to free, online versions of BIG IDEAS student textbooks for 6th grade, 7th grade, 8th grade, and Algebra 1. These are the books I begged for at my old school, and then I left before I had a chance to use them! Excited to see this!!
Calculus for Beginners and Artists is an online textbook that provides an overview of Calculus in clear, easy to understand language designed for the non-mathematician. Thank you MIT OpenCourseWare for awesome, free resources and classes!!!