It's always great when someone in the field creates a valuable teaching resource. Karl Stolley's Sustainable Web Design is an excellent introduction to desigining websites with XHTML and CSS. What I especially like about is that it begins early on with an introduction to markup languages. If writing teachers are going to teach XHTML/CSS in writing for the web and multimedia writing classes, I believe we need to also introduce our students to the general concept of markup languages to prepare them for using XML in the future. XML is coming even though it isn't on everyone's radar yet.