Apparently this isn't a new idea, would be nice to see how it pans out.
I really think Ajax (XMLHTTP) found its way to the main stream because browsers began to support the functionality. Both Opera and Safari added support for it only last year (I could be wrong but I remember that it was fairly recent) and I think that was the icing on the cake. It's cool and it's cross browser. What else can you ask for ?
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