Several developers/speakers around the PHP community has posted their upcoming schedules for conferences and what they're presenting. Here's just a few:

• Andi Gutmans - AjaxWorld Conference & Expo ("How and Why PHP Makes a Successful Back End for AJAX"), SD West 2007 ("Modern Web Applications & PHP"), MySQL Conference & Expo ("The State of PHP and MySQL"), and an IBM webcast ("Vista Powering Rich Internet Applications with Zend Core for IBM").
• Mike Potter - Portland PHP user group meeting (PHP & Flex)
• Sara Golemon - php|tek 2007 (Writing Extensions and Security PHP Applications)

Keep checking back to this post for some further updates as they're posted by other speakers. There's loads of conferences happening in 2007 (more popping up all the time)!