Andi Gutmans mentions a program Adobe is starting up concerning Flex and PHP and they're looking for some developers to get in on it.

In this upcoming version [of Flex Builder], a significant new set of features are being introduced to accelerate creation of data-centric applications with PHP on the server-side leveraging Zend Framework and Zend AMF. Prior to the public Beta later in the year, Adobe would like to invite a select group of PHP developers into a private pre-release program for Flex Builder.

The group would get a sneak peek at the upcoming features, work with the development team and help to make the product into something the community really can use. If you'd like to get in on the program, fill out this survey and they'll get in touch with you with more information.