If you are looking for interactive, educational books for your small children, check out Schoolside Press - http://www.schoolsidepress.com/index.cfm
Great for parents & teachers!
And if you order direct, you can even recieve an autographed copy - it doesn't get any better than that!
If you are a writer of children's books, it's a good site to explore as well. Creating a product that will sell and a website people like to use is vital!