A good introduction to the core of Perl, written clearly with plenty of examples. It doesn't go beyond the very basics, or describe many real-world applications, but it's a useful read for beginners.
The article briefly surveys a number of new Web technologies such as XLL, XSL, RDF, DOM, MathML, SMIL, PGML, and how they relate to XML. Benefits and potential applications of XML are stressed.
A thorough Cascading Style Sheets tutorial. Detailed information is included on the CSS "Box Model, " with sections on using CSS to control the margin, borders, and padding.