ALSO - it is very easy to follow the Book on the road BECAUSE it explains exactly what each line of code in examples does;
Very thourough analysis and not much mumbo-jambo (as in xslt for dummmies book)
At this point this book and the W3.org site that hosts the xml official specification documents (xsl, xslt, xpath) is all I need. FYI, I'm developing an application in Visual Studio .NET 2003 with C# and using this environement to author and test xslt. Too bad Visual Studio won't validate xslt until you do the actual transformation in code. Oh well. Enjoy...