Professional Ajax 2nd edition by Nicholas Zakas, Jeremy McPeak, and Joe Fawcett - is another book which I was able to have covered as a work expense. I've read through several sections (and also skipped over others). This book serves as a good introduction ti Ajax with examples, and a few case studies on more advanced applications (AjaxMail, and a few others). Covers the history and usage of ajax, along with a chapter on typical design patterns (like implementing a priority queue for requests). Overall it's a pretty good book, but as I have another reference for JavaScript (which includes small sections on Ajax), I don't find much extra use in this, perhaps a few chapters out of the entire book. Covers libraries (such as the .Net Ajax extensions, and others). The cover price is $40, and I would value it at $15-$20, rated 3.0/5. Worth taking a look at, but really look at it before buying to see if it will help you.
