Like most O'Reilly books, this is as lively and interesting as it can be considering the subject matter. The only part that what was a bit hard going, and it may be my own dimness, was the section on the relationship between RDF, XML, and RSS (.91, .92, 1.0 and 2.0). I think RDF is conceptually tricky and may need a longer section devoted to it. On the whole, however, this book has come to help me tremendously in my work.