A short but even quite thorough introduction to the world of existing and slowly dying solutions for those who want to dig into the web and master the art of correct use... But of course you could have easily just visited the wikipedia pages or google interesting information around to further your knowledge... Still if your eyes are read, you can't watch the screen anymore or your teacher requires you to put bibliographical notes in the short paper you've just managed or are planning to finish using wikipedia database as theoretical knowledge/background it could be wise to just check this short book and skim for required information... At least no one would say that you've merely CTRL+ACVPed the site, since you also have to read and type. For those looking for a comprehensive bible this just wouldn't cut it.