I just received print copies of the Ajax Testing article I wrote for Better Software Magazine. The article is an overview of free tools that no Ajax developer should be without: Firebug, the JavaScript Shell, the Web Developer Toolbar, Tamper Data, and Venkman. I have been talking about these tools for a while now, and Thomas, Amy, and others have given similar talks. I am always surprised to find that a number of programmers in any given room are unfamiliar with most of these tools.