I’ve heard of it, but from what I know it is no longer being published so it is hard to find a copy, if not impossible. Some people use Life of Fred when they want a storyline. And there are lots of math story books like the Sir Cumference series, the MathStart series.
Living Math website has lots of topics and lists books for those topics under the Readers tab. http://www.livingmath.net/Home/tabid/250/Default.aspx
Hope that helps!