The 0.48 should give you pause. It is perhaps the most provocative aspect of this book; it deals with software that is not 'officially' released as a polished product. Yet given this, Hiitola shows a level of ability present in Inkscape that seems easy to pick up and use.
The many screen captures of examples demonstrate how to use this to develop scalable vector graphics. The concept of drawing an image that can be arbitrarily scaled up or down without losing resolution is powerful, if you have never met this idea before. The text shows that this contrasts vividly with raster approaches that are exemplified by JPEG, GIF and BMP images.
Importantly, Inkscape lets you import those raster files into your vector image. This lets you integrate the free flowing and free scale drawing that characterises Inkscape with real world legacy images, that are inherently raster. An important point that the text helps you grasp. Because "pure" vector images are not that common as a practical consideration. A webpage on a commercial website might have to have raster images depicting some product or scene. Inkscape gives you the means to merge in scalable vector data.
Speaking of images, and photos specifically, the book is upfront in acknowledging that you cannot do intricate photo manipulation. For this, other packages like Adobe Illustrator might be better suited. But keep in mind that this is only version 0.48 of Inkscape. Several filters are already available, like blur and bump. It is very reasonable to expect that as Inkscape [rapidly?] improves, many other filters will soon be provided.
The book also discusses, albeit briefly, the overall design of a website. Useful in getting you to think about carefully designing a consistent approach to an entire website, that makes it easy for a visitor to navigate without getting confused. Perhaps the brevity of this portion of the narrative was because its guidelines are not restricted to using Inkscape, and the author did not want to stray too far off topic.
This book covers the basics. However, there's nothing you couldn't get off of the internet.
I found this book disappointing. The designs in the book are pretty ugly and look amateurish. Inkscape is such a great piece of software, I just feel like the book could have been more ambitious and the tutorials more polished.