Academic Superstore sells software, computer products, learning games, books and lots of other interesting things related to eduation. You can get some high end products with great educator discounts. Some purchases require proof of eligibility, which you can get through membership in Homeschool Buyer's Co-op (and other hs organizations.)
Free interactive lessons, games and quizzes on biology topics. Looks to be about jr.
A nice informational site where you can "see the world through children's eyes." Includes maps, g
Free art lessons for elementary ages.
Online reading, math, and spelling curriculum for elementary ages.
Complete math curriculum for jr. high and high school levels.
This subscription site has loads of resources for learning through children's literature.