Yesterday Zend released a preview release of their next version of the Zend Framework, which includes the ZendAMF module. This is the first release of the framework that includes the module, which follows the partnership announcement made last month.
Developers can learn more about Flex and Zend by visiting the PHP page of the Flex developer center.
There are also 2 upcoming e-seminars that would be of interest to PHP developers. Both have the same content – a technical talk about getting started with Flex and AIR using the Zend Framework and ZendAMF. The first session is next Wednesday, October 22nd, at 10 AM PT, and the second is Wednesday, November 12th, at 10 AM PT. Free registration is required for both sessions.