This book starts on a bad note by not providing a rigorous definition of a corporate portal. This gives the authors license to write as if any system is a corporate portal.
Most of the book is composed of the authors' ideas on information engineering. Though they keep referring to portals, the information the authors present seems much more relevant to traditional systems development. The authors seem to have no concept of a corporate portal as intellectual (and tangible) middleware. Also, though they repeat the assertion that over 90% of the information business people use is unstructured, they seem to have left out any further in-depth discussion of the peculiarities of unstructured information.
The information on XML is pretty standard stuff. The authors fumble their attempt to make a case how XML fits into the concept of corporate portals (which would be hard to do because they have never presented a clear concept of a corporate portal.)
If you are familiar with the concepts of information engineering, you may enjoy the authors' latest thoughts on the topic. But as a guide to designing and implementing corporate portals, this book is a major disappointment. In a nutshell, the authors do not provide the information on what makes corporate portal development different from development of other systems.