Ajax in 10 minutes

I recommend the following book on getting started with Ajax:

Ajax in 10 Minutes
Sams Teach Yourself
Phil Ballard

http://www.amazon.com/Sams-Teach-Yourself-AJAX-Minutes/dp/0672328682

My only complaint is that the first half of the book does a brief overview of Javascript, HTML, CSS and PHP. I already know all of that stuff so I didn't really need the refresher chapters but overall the sections on Ajax were very thorough. It had some good explanations and easy to follow examples that I coded for myself just to make it sink into my brain.