Its actually not too bad if you are already good at Javascript, and understand a little bit about the server-side, you can pick it up pretty easily. Really, all it is using Javascript w/ DHTML, except in your Javascript you have access to the XMLHttpRequest object, which lets get data or content from a server-side call, and then dynamically alter page elements without having to refresh the page. Not rocket science at all.
In the same vein, there's also Macromedia Flex, which has the same basic idea behind it, except it uses Flash and Actionscript (does many of the same kinds of things Javascript does, but language-wise is kind of like a cross between Java and C#). I took a training class from them up in Boston a while back, and its kind neat.. although I don't know Flash too well so I was a bit unfamiliar with some of it.
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Sprinkle on your sponge.
Scrub bathtub or whatever until clean.
Works for me.
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In the same vein, there's also Macromedia Flex, which has the same basic idea behind it, except it uses Flash and Actionscript (does many of the same kinds of things Javascript does, but language-wise is kind of like a cross between Java and C#). I took a training class from them up in Boston a while back, and its kind neat.. although I don't know Flash too well so I was a bit unfamiliar with some of it.