Web Style Sheets W3C's authoritative overview of style sheets for the web. http://www.w3.org/Style/

CSS and XSL: which should I use? Brief article from W3C with a diagram of the markup-to-presentation process for HTML and XML documents. http://www.w3.org/Style/CSS-vs-XSL

Demystifying Digital Versatile Disk A detailed look at DVD technology. http://www.cd-info.com/CDIC/Technology/DVD/dvd.html