Rating: 

This book is not about marketing Ruby. It's an essay whose goal is to forcast the key issues for application development over the next 10 years and correlate them with the current programming lanaguage landscape.

The author's conclusion, that of all the tools he examines, Ruby is the better fit, is carefully grounded in the discussion. The conclusion is one you, the reader, are free to dissagree with, but along the way you will learn something about the current state of Java, C#, Smalltalk, Python, Perl and Lisp. I knew nothing of Django and Seaside before I read the sections on Smalltalk and Python.

I find it unfair to this excellent and readable essay to brand it "Ruby marketing".