The Zend Developer Zone has a bonus episode of their PHP Abstract podcast series posted, a different sort of episode - it's a video podcast as hosted by Davey Shafik and covering the combination of Ajax and PHP (and debugging all along the way).

Davey is a full time PHP Developer with 10 years experience in PHP and related technologies. An avid author for both magazines and books author, Davey keeps his mind sharp by trying to tackle problems from a unique perspective. Today Davey is going to show us how to debug Ajax applications using Firebug and the Zend Developer toolbar.

You can grab the video [mov] directly from the ZDZ site or subscribe to their feed to get this and other great podcasts.