I an working with my 4 year old to teach her alphabetical order.  We decided to build an alphabet train, which included the letters, a word for each letter, and a picture.  We have done this once before and she seems to enjoy it. The classic moment was the picture I took of her as she was singing the ABC song to figure out which letter came next.  I also like the picture of her studying what will come next. We could always time this to make it a race against the clock to see if she can improve her speed in placing the letters in the correct order.  So many possibilities for mixing this up some.