After having read the HTML5/CSS introduction in form of 'Complete guide to HTML5', the natural progression was to dwelve deeper into JavaScript. This little volume does a pretty decent job in this respect and covers all the basics of JavaScript as a programming language. For someone with my background (20 years of programming, first in Java, then in C#) it was a bit simplistic at times, but one has to keep in mind that it's intended for absolute beginners.