Today I noticed the book "Prototype and script.aculo.us: You never knew JavaScript could do this!" and while you do not need a book to learn P&S, this book will definitely induce a good 6 months to a year of experience into your skill set.  The book is available on Amazon in print or on the book's website in PDF format.

If you only want to know the basics of P&S, then you'll be fine with looking over the Prototype documentation and script.aculo.us samples.  However, regardless of how deep you want to go, you should definitely check out the freely available source code for the book available on the book's website.

As always, let the tools do the work, but don't rely on them for everything.  It's critically important that you understand AJAX developer from a deep mechanical level before you start using JavaScript or AJAX frameworks.  If you aren't well-versed in JavaScript and AJAX development, then I highly recommend AdvancED DOM Scripting: Dynamic Web Design Techniques by Jeffery Sambell.

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