I just finished The Little Schemer. I liked it. It's a very short book. Most of my time was spent doing the exercises, which were very worthwhile. There were a few sections I had to read twice, but the book was far more accessible than say SICP. If you've never coded in Lisp or Scheme or if you're looking for some good exercises for your coding fu, I highly recommend this book. Happy hacking!
Ad maiorem Dei gloriam inque hominum salutem.