It came up when I searched "PHP Ajax", and I'd like to know if it's worth my time and effort, or if I should branch out and add in Ajax functionality without a toolkit to help me.
(I'm working on a website for a friend, and I'd like to add a little bit of Ajax to the RSVP page (not yet up) to help the user experience. If it's too much effort, I will do it old-school with lots of post-backs.)
I'd just use MooTools and PHP's built in JSON (http://us.php.net/json) --- you can make out-of-band requests using MooTools's JSON client, get a hashtable back, and then do as you will :)
I'd be happy to put together an example.