AJAX and rich clients are indeed intimately related, contrary to what some people say. And it’s not just that they sprang up at the same time, in the same companies, and are therefore associated with each other.
Stewart Butterfield brought this point home at the BayCHI Web 2.0 panel. The following is a transcription [via] from the podcast of the event:
That’s the relationship between AJAX and Web 2.0. AJAX applications have de facto public APIs, which are inherently remix-friendly.