Ignore the reviews of the 1st edition of this book (2000). Now in 2001, The XSLT 1.0 standard has effectively been ratified and is now stable; 1.1 is in the works and the XSLT processors all achieve good levels of compliance. This is currently the most up to date and comprehensive book on XSLT. Not only covers XSLT in depth but also has chapters on the main XSL processors. Excellent examples throughout and a nice, readable style of writing.