Hello, If I want to be a high level user/wizard/professional of TeX, I can buy the TeXbook and learn everything in it and experiment a lot. Here is a very interesting but heavy work to do. If I want to be a high level user of PDFTeX, I'll have to be a wizard of TeX and a professional of eTeX : Very heavy work If I want to be a high level user of LuaTeX, I'll have to be a wizard of PDFTeX, Lua, Omega, Aleph,... : Very very heavy work. So if I want to be a high level user of LuaTeX, I have to learn everything about the thirty years old TeX history. When LuaTeX will stable enough (LuaTeX v2.0 ???), is it on the roadmap to write a "LuaTeXbook" just like D.E. Knuth did in 1983 ? The idea would be to explain completely the functionalities of LuaTeX as if nothing had never existed before, it would be the opportunity to give users a new start in the world of TeX who allows to understand this programming langage (LuaTeX, not TeX) without having to look for all pieces of the puzzle. Of course, this "LuaTeXbook" would deal with Lua (and why not lua libraries, fontforge...) but we must bear in mind that the TeX aspect matters most. This book would be a very heavy project but it would be a very useful tool. Arthur