Google has made my life a little more difficult, but in a good way. Now that google has their Gmail and Google Suggest sites up and people are using them and loving them. They’ve become the new standard/model for user interfaces on the web. Till these interfaces things like web mail haven’t advanced very far since 1999–2000 as far as the user interface goes. However with Google proving that application that use AJAX are a very viable method of enhancing a web interface without the use of plug-ins like Flash or Shockwave. The browser support for these applications are wide reaching as is the kind of applications that they can use it.
In short, I think that AJAX applications are only going to grow in popularity and complexity. Popularity because it provides a user experience closer to a native application. Complexity because the developer is going to be knowing where and where not to use these methods. With a little forethought by application developer and architects web applications can be dynamic, easy to use and secure, but only if we user AJAX, where it makes sense, not just to use it.