I recently found some neat sites that allow you to print out educational kid's materials. One good site is Everything Preschool. They have recipes on there for making your own gooey fun stuff, like playdough and goop and slime and finger paints and all kinds of fun stuff.
Another great site is Starfall.com, where they have the alphabet and learning to read programs along with sign language too. It's amazing the great sites you can find for free learning.