Tongue in cheek, but looking at the focus of the questions here, would you have put more emphasis into AJAX or even remove it from the title given the feedback? Also, was it your your idea or marketing's?
As I said in an earlier post, I don't have any say in the title. It's all up to marketing!
The title is a difficult call. The book does cover the fundamental things required for Ajax because Ajax is such a mix of technologies. But it only devotes one chapter to pulling it all together.
I think one issue that seems to have arised is that the term Ajax is not well understood and that people expect it to be a single technology rather than an architecture.