Kidzone: Free Worksheets and More
I found this site while searching out line tracing worksheets for my two-year-old. It has a nice assortment of worksheets in several subjects, plus lesson plans, fun facts for kids, and links to other helpful sites. I can't wait to start a Story Quilt with my girls!
There are resources here for preschool through 5th grade. I can't speak to the material for older kids, but 4 1/2 stars for preschoolers.