On Dotvoid.com, there's a new post that reminds us of two of the more "ajaxified" features of the new releases of PHP 5 (like 5.2) - the JSON extension and the functionality to track file uploads.

These features aren't competing for the heavy weight title in the release notes. Still, having these implemented in PHP makes it a lot easier to develop modern, more responsive, web based applications.

You can get more info on the JSON extension here and an example of the file upload monitor in this entry on the Bitflux blog.