It covers a lot of ground in a slim volume (just as in "The Little Schemer"). This book introduces the concepts of closures and call-with-current-continuation (among other things).

As with "The Little Schemer", this book's strength is in its socratic instruction method. Lessons are written and illustrated as conversations between the reader and the instructor (in question/answer format). While this sounds strange, it is actually surprisingly effective as a means of learning the material. It might seem somewhat like rote instruction, but it can often frame foreign concepts in a rememberable fashion.

Neither of these books require much in the way of background or familiarity with the material. They were created as a means of teaching non-programmers to program in Scheme. However, I think they hold value for trained programmers as well.

Focuses on the use of functions in scheme, in an easy reading, enjoyable style. My only minor criticism is that the typographic conventions make the code hard to read. I realize that they serve a purpose, but it made the typesetting ugly.

An admirable work, suitable for reading even if you already "know it all", just because of its approach to teaching.