The Zend Developer Zone has posted the latest episode in their "ZendCon Sessions" series of podcasts. These sessions were recorded live at last year's Zend/PHP Conference. This episode is from Sara Golemon's talk on writing extensions for PHP.

The ZendCon Sessions are live recordings of sessions that have been given at previous Zend Conferences. Combined with the slides, they can be the next best thing to having attended the conference itself. [...] This episode of The ZendCon Sessions was recorded live at ZendCon 2008 in Santa Clara, CA...and is Sara Goleman giving her talk: "PHP Extension Writing".

You can get this new episode one of three ways - the in-page player, via the mp3 or by subscribing to the podcast feed.