Just to put my two cents in, as a general reply to a lot of comments here... this is a very, very early draft in progress, and I didn't expect anyone to pay attention to this project, let alone post it everywhere. It needs a lot of work, particularly in toning down the Lisp Evangelism, and staying true to the methodology without accidentally parroting Zed Shaw's voice.
Zed Shaw: it means a lot to me to get your perspective here. Yes, you and your series ultra-inspired me. I've wanted to write a book on Lisp for a long time, but it wasn't until I was pointed to your series that I felt like I could give Lisp the perspective it was missing. I'll make a point of editing the Preface more carefully---everything that's up there so far, I wrote off the top of my head with very little editing, so I guess in following your method and format I accidentally used some of your words as well.
Thanks everyone!