HTML_AJAX 0.4.0 has been released. You can upgrade using the PEAR package manager in the normal ways.
The biggest new feature is the addition of a setInnerHTML method that runs any JavaScript in the string your using to update and elements innerHTML property and the addition of an ordered queue. The ordered queue makes your AJAX requests return to the client in the same order they were sent. One of the biggest area’s this comes into play is when creating livesearch implementations or any other time you’re making lots of AJAX requests and overwriting the results of the earlier ones with the results of latter ones.
More details (including a place to put testing results for your browser of choice) are available in the release notes on the HTML_AJAX wiki.
I’d also like to thank Laurent Yaish for helping with the testing of this release and Arpad Ray for working with me until we got the optimal implementation of setInnerHTML.