>Simply put, PDF is a format designed to allow me to give you a document where you can be sure (with certain well defined exceptions that I can work around anyw

>Simply put, PDF is a format designed to allow me to give you a document where you can be sure (with certain well defined exceptions that I can work around anyway) that you see what I intended you to see. Well put. When I buy technical books, I always look for a PDF format. I want a copy of the book that is the same as the printed one and that's exactly the reason why I like PDF. Plus, things like diagrams and graphs are in vector graphics, and not raster as they are in EPUB/MOBI. I've made the mistake of buying a couple of technical EPUB eBooks that contained graphs, and in all cases it was a complete abomination. The publishers seem to want to produce the smallest files they can, so what used to be vector graphics, become highly compressed and low resolution raster images. Trying to zoom in on a graph on your tablet gives you a resized blurry image. I don't like this trend where some technical ebook publishers offer a PDF version of the book in addition to an EPUB, and the PDF ends up being a mere conversion from the EPUB version, having all the cons I mentioned above. This happened to me on InformIT when I bought "The Mythical Man-Month", and they ended up giving me a refund.