Ajax in 10 Minutes
Sams Teach Yourself AJAX in 10 Minutes (Sams Teach Yourself) Ajax in 10 MinutesThis is great book by Phil Ballard that describes the Ajax web technology using short, concise examples. Since Ajax is really just a collection of existing technologies, "Ajax In 10 Minutes" is especially good for experienced developers who may already be familiar with the underlying and just need a high level description of how these technogies interact.

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