The copywriting is a little over the top, but my suggestion is for the book itself.

I'd like to see more details. Your sample chapter on Lexers, for example, would be much stronger if you went into more details (maybe 3-4 pages) on how a scanner identifies a token, how it knows when it has reached the end of a word, how it recognizes and handles whitespace, why it's important to keep track of indentation and newlines, what is the difference between keywords and other identifiers, etc. Maybe also give a written explanation describing what each section of your lexer for Awesome is doing.

Please consider this as constructive criticism: I think the book is a good idea, but I also think it needs more meat. I don't know how easy it is to revise it at this time, but I think you'd have better luck if you added more details.