I LOVE this book. I've had a hard copy for years. I always felt kind of lonely, though - it's such a niche topic that I had trouble finding anyone else interested enough to actually work through it :) So it's great to see it on the front page of HN.

Its software, scmutils, includes an emacs-like editor and execution environment called Edwin. Here's an oooold blog post I wrote about using GNU Emacs with scmutils instead: http://ai.redsymbol.net/2007/06/using-gnu-emacs-with-scmutil...