Background See earlier review.
Market and audience The market for books on extensions to standard programming languages has traditionally been small, but as C is probably the most widespread language of development, I would expect that in this case it would be bigger. As this deals with C, I think it is probably worth it. So far as I can see it is accurate, but a technical copyedit from a C expert with WEB knowledge should be a requirement. The organization is very good, the only small question I would raise is the listing of the error messages before the section on Change Files. The overall style is clear and simple, with short sentences and a good consideration of the reader's logical train of thought.