Ayende's "Building Domain Specific Languages in Boo" book

The book is now available for as part of the Manning Early Access Program. Chapter 1 to 4 are already there, but they are there in their nearly raw format. That means that they have not been edited yet, and I didn't put in the results from the review cycle that we did yet. Ayende would appreciate any feedback that you have on the book, the topic, the code, etc.