There is one tool that I used that is very useful in teaching your children. Preschool Prep Pack - 4 DVDs (Meet the Letters, Meet the Numbers, Meet the Shapes, Meet the Colors)
My 17 month daughter can count from 1 to 10 and she know some of the shapes and colors! And my 3 year old daughter knows all her ABC's,colors, and can recognize numbers from 1 to 30 and she can recognize 60 sight words and can read a little which is really amazing!
So I can't say enough about Preschool Prep Company.They really know what they were doing when they made this learning program.