Vinu Thomas points out an interesting bit of technology in his latest post today - PHPLiveX, a bit of Ajax to PHP "glue" that doesn't require you to know Javascript.
If you're looking for the quickest way to get your PHP functionality Ajax enabled, you've got to take a look at PHPLiveX. It greatly simplifies the process of Ajaxifying your PHP code without knowing Javascript code.
He starts with a simple function to give you an idea of how things tie together. It creates a simple link ("Get Server Time") that fires off the Ajac request to the PHP backend, returning the local server's time - all with about 10 lines of PHP and HTML (well, the needed HTML).