We ran across these laminated place mats a couple of years ago - started off with dinosaurs and the solar system, we now have:
multiplication tables up to 12 x 12
the periodic table
Flags of all the nations
The Night Sky and the constellations and
Cursive handwriting.
The boys fight over who gets the periodic table (!) but it has certainly sparked an interest in learning multiplication - down to having "contests" with friends who come over and do anything on our kitchen table.
http://www.painlesslearning.com/they're actually quite fun! (and I think DS9 has the periodic table memorized)
