When I saw Junior Scrabble Cheez-Its at the store, I had to get them. My son loves all things letters, and enjoys spelling. He once had me pull out letter after letter until I got the right letters to spell a word he was working on. They taste great, just like regular cheez-its, but with the added element of fun. Add a couple to your kid's lunch box and see what they spell!
(Just be prepared for complaints if you don't send enough vowels...)