You might think that full-color illustrations would make very little difference in a technical book.
York starts with the basics of jQuery – selecting elements on a page and applying styles dynamically – and moves progressively into more advanced topics, such as making Ajax calls and accessing the jQuery API. He devotes about a third of the book to jQueryUI, a library that contains controls designed to build rich, interactive web interfaces without the need for a lot of code.
The book is filled with examples, showing the HTML, CSS and jQuery demonstrating each point. You can read/copy these from the book or download them from the Wrox site.