Obsolete??? Hardly. As I write this review, new Web page technologies are being matured: jsp, php, chm (yech). New models are being matured: Servlets, STRUTS, .NET. Classical ASP 3.0 is still quick, fast and necessary for small to medium businesses, even enterprise-level webpages. There's no better book to learn all the standards, applications, basics, and advanced capabilities of ASP than THIS book.
I love Wrox. I started with their Beginning ASP 2.0 book (how I learned). This book, a bit more advanced but in the beginning level, is still all you need to get things going from single tiered applications to multi-tiered, database driven apps. It goes into COM objects and other MS Services like Index. Really a one-stop book.
With this book and Google you have all the reference you need.
Note: ASP 3.0 is in no way, shape, or form similar to ASP.net.
A small, tiny complaint about this book is that it can be a bit wordy...just a tad. And the index in the back could use a bit more improvement. The info's still in there.