Professional Ajax by Nocholas C. Zakas, Jeremy McPeak, Joe Fawcett is a fantastic book on AJAX which is the common buzzword now a days.
This book starts with the evolution of Ajax with in-depth discussion of many related technologies of Ajax. Very lucidly it described from beginning to advances technologies like Ajax Patterns, XML, XPath, XSLT, RSS/Atom, JSON, Webservice etc. The book has dealt with many practical examples even with some projects like Widgets and Ajax base mail system. They covered Ajax Frameworks for PHP, JSP and .NET too.
Its really a book, who wanna discover most of the features, techniques of Ajax and make very very good concept on Ajax.
The pages of the book is fantastic and the binding is very much comfortable for reading too which really worth your money.
Thanks authors for such a great book.