Technology is changing pretty fast and so is the user interaction with web applications. Earlier whenever a user used to click it would freeze the browser and only after that the new content would appear. Now with the advent of Ajax an entirely different set of user interfaces are being implemented but as of now users don't even have a clear understanding about it.

My friend Ivan has gone ahead and written a very interesting post about how visual cues could aid the Ajax application users to get a better understanding of the application and which all pages have gone through modification. You will also get to learn how you can add visual cues. Hope it helps!!