Teaching shapes and colors is one thing. Real life skills is entirely another - like, getting a job. Such an essential for a 4 or 5 year old. ;-)
Actually, my philosophy has always been that start talking to children about the grown-up world as soon as possible. For one thing it is so fun to listen to their impressions of the world, and for another to be able to explain things to them and see their faces light up as they feel more included in what is going on around them.
"How to Get a Job by Me the Boss" was both all in one. Written from the perspective of a little girl trying to teach her baby brother all about how to get a job in any industry. Filled with many child-like misconceptions, this book for children will not only give the adult some laughs, but will serve as a great teaching tool to explain things to your preschooler or kindegartner who is curious.