I've recently uploaded the first revision of Open Power Libs port for Zend Framework to our SVN repositories and it is available there for public audience. The port is not completed yet, but the basic functionality is present and seems to work. I encourage everyone to test it and submit suggestions or noticed bugs. The package includes a test ZF application, and the source code is well-commented. I'll put some extra information on wiki soon, as well as set up the "real" user manual.