Books To Read About AJAX

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Ajax in Action by Dave Crane, Eric Pascarello, Darren James:
http://www.amazon.com/Ajax-Action-Dave-Crane/dp/1932394613

or

Ajax in Practice by Dave Crane,Bear Bibeault, Jord Sonneveld, Ted Goddard, Chris Gray, Ram Venkataraman, Joe Walker:
http://www.amazon.com/Ajax-Practice-Dave-Crane/dp/1932394990

Also:

jQuery in Action by Bear Bibeault, Yehuda Katz, John Resig
http://www.amazon.com/jQuery-Action-Bear-Bibeault/dp/1933988355

That is, if you need details...