The Zend Developer Zone has posted one of the older webinars from Zend's "Webinar Wednesday" series to give you a taste of what they're like - Bill Karwin talking about the Zend Framework's database access functionality.
Zend sponsors Webinars every Wednesday covering a wide variety of topics of interest to PHP programmers. If you look over on the left sidebar [of the Zend Developer Zone site], you'll see the last five that have been published.
You can also keep up with the latest webinars by befriending the webinarzend user on Twitter. The next PHP-related webinar is coming up on July 2ns and will cover PHP security (Kevin Schroeder presenting).