Although there are many books on scripting, there are only a handful of books about VBScript. Of those that do focus on VBScript, many pages are devoted to server-side web scripting with active server pages, which is amply covered by the many titles on ASP. This book by contrast is current, complete, and packed with chapters about all the cool things you can do with VBScript, including COM objects and how to write your own, regular expressions, HTML applications (*very* cool), ADO, how to build the Script Control into your applications, and yes, ASP. That's the first 500 pages. The remaining 280+ pages are references and appendices that add depth. I have seen no other reference in print or online from Microsoft that goes to these lengths to elucidate what can be done with VBScript.
The writing style is very approachable, and the Wrox Press model of a team of qualified people tackling different topics works very well (11 authors and 7 technical reviewers). These people really know the topics, and the book is well edited. An excellent value.