Simon Willison: JSON and Yahoo!'s JavaScript APIs: "JSON and Yahoo!'s JavaScript APIs
I had the pleasure yesterday of seeing Douglas Crockford speak about JSON, the ultra-simple data interchange format he has been promoting as an alternative to XML. JSON is a subset of JavaScript, based around that language's array, string and object literal syntax.
As of today, JSON is supported as an alternative output format for nearly all of Yahoo!'s Web Service APIs. This is a Really Big Deal, because it makes Yahoo!'s APIs available to JavaScript running anywhere on the web without any of the normal problems caused by XMLHttpRequest's cross domain security policy.
Like JSON itself, the workaround is simple."
This is liked to by the previous link: Excellent Ajax Article with LOTS of informative comments
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