Zend has a series of free webinars on various PHP topics that is constantly ongoing. There are three of these webinars coming up on the schedule this April, and you do need to go and register for them ahead of time.

• WEBINAR: Set up a complete PHP environment in minutes!
• EBINAR: Advanced Management for PHP for i5
• WEBINAR - How to increase application performance using caching

The post has descriptions of each as well.