Look at Google Analytics. Their sexiness comes from their gorgeous client-side Flash, not because they get stuff asynchronously from the server. Look at Google Maps, the original Ajax app. You may say “#$ @%, what are you talking about: Google Maps are all about the async stuff!”. No, Google Maps are about drag-and-drop. If you needed to click the stupid “left arrow” button to get the map of what’s to the west, you wouldn’t care that only a part of the screen is being refreshed.