If you don't really know what XML is, this book is too hard for you. If you do and you're sick of all the introductory books and tutorials, give this a try!This book is a really useful book full of useful tutorials. It deals with the possible ways you can work with XML. It has examples in scripting languages (ASP and JSP) and a lot of XSLT. I particularly got a lot inspiration by the XSLT part. Some of the XSLT examples get pretty sophisticated, for example with the use of the key() - function.
If you don't really know what XML is, this book is too hard for you. If you do and you're sick of all the introductory books and tutorials, give this a try!