Ok, this really irks me. Why do people keep writing and printing paper books that will become obsolete before even the first batch is sold out? Topics like this, or the latest (at the time of writing) version of jQuery or other things that have lifespan of few months? Surely this is just a waste of money and paper for everyone. I can see the value of e-books, or even print-on-demand publications, but not this. Those books end up either cluttering the local libraries or pissing off second-hand bookshop employees because no-one will buy or read them in a year. It's almost a printer-to-recycler pipeline.