The date is kind of arbitrary - "Ajax" existed before it was called that. And it is a bit of a misnomer - you see less XML and more JSON in this popular pattern. But, for your information, today is the 5th anniversary of the blog that launched a thousand Ajax apps. Jesse James Garrett, Doug Crockford, Justin Gehtland and others comment on the event.
Do you have any comments on the past or the future of "Ajax"?