A good introduction to XML and some associated technologies such as DTDs, schemas, XSLT and CSS, and a pleasant change from all those books whose authors think they won't be taken seriously unless they fill at least 750 pages.
The publisher claims that this guide "uses pictures rather than lengthy explanations", but most of the pictures are simple screendumps of text in an editor. The pictures are more useful in the CSS layout section; however, there are better books on CSS than this, for example by Eric Meyer. (Most are based on HTML rather than XML, but the principles are the same.)
Nicely laid out and printed,and no significant errors or typos. Just a reminder: this book does not cover the DOM, SAX, SOAP or XML-RPC, so you will need to look elsewhere if that's what you need.