Suddenly, AJAX is everywhere!  As a frequent user of web applications such as GMail and Flickr, I love it for the enhanced usability (although I must admit that even after eight months of using GMail, I still have difficulty accepting that the server really has "starred" my mails when I click to do so, and I find myself refreshing the list just to prove to myself that a call to the server has been made!)  As a developer of web applications, I just wish it had been around a few years ago, as it would certainly have improved the performance and usability of some of the more complex sites I've worked on.

Here's a bunch of AJAX-related links that I've read recently: