Online resources for homeschooling

Here's a great page that lists tons of helpful online resources for homeschooling (mostly free). As we gear up for preschool homeschooling, we plan to use some of the items on this list.

http://peregrinhouse.blogspot.com/p/resources.html

Really great preschool/k curriculum (also free). Three 12 week units that flow with the seasons.
http://weefolkart.com/content/homeschool-companion-guides