After rereading your post, I realized what you meant by moving rendering/layout to the client. I misinterpreted, so I apologize.

I try so hard not to be "that guy", but when did people start using the word AJAX when they mean DHTML? Or when did that become acceptable? AJAX is about asynchronous communication between web client and server; it has nothing to do with manipulating the DOM, which is what DHTML is for. I can understand the desire to lump the two together because they tend to go hand in hand, but when you say something like "AJAX moves rendering/layout of dynamic content to the client," you couldn't be any more wrong. Rendering and layout is handled via DHTML.