Counting books are fun for kids as they learn how to rote count. My personal favorites are the ones that teach you how to count in a foreign language. I love learning foreign languages. And the sooner you start teaching kids words in different languages, the easier it is for them to learn them. I was fortunate to learn both French and Spanish when I was in Montessori school, focusing on French in elementary school. I can see how this foundation helped me in my later studies of other languages.
I have used these books with kids in my classes, as well as for my own personal studying. They are great for cultural lessons, too!