Probably it is good thing to announce now ( to mobilizie myself!!!!) ... I write two books ... Based on my lectures on cryptography and on XML technologies the two texts grow slowly but steady almost every week. As for cryptography one, I devided it in two parts. The first is about cryptology history (I would not dare to write it if I had not chance to read the monumental Kahn's "The CodeBreakers") the second is about modern cryptographic techniques described in almost-non-mathematical way. The intended audience of the books are my current and future students of The Academy of Humanities and Economics in Lodz. I can not afford two much of math there :-(.
The XML book covers XML basics and some selected XML technologies. Both are (unfortunately) so far in Polish. However, the fact is that all informal notes I make while preparing the material is in English, so maybe one day .... :-)