Using the XMLHttpRequest Object and AJAX to Spy On You

I haven't made the time yet to play with AJAX (Asynchronous JavaScript and XML). It seems to be a great way to program a more interactive user interface for the web. Google Maps is a good example of the usefulness of this approach. I also agree that there are some hidden dangers to this new approach as this article, Using the XMLHttpRequest Object and AJAX to Spy On You, discusses. I think time will tell if AJAX will become the web application architecture of the future or not. My prediction is it will be another useful tool that will continue to gain in popularity and gain an equal footing with traditional "post and response" web applications.