As per this announcement on the Zend Developer Zone website, the Zend Framework group has released the latest version of their application framework - Zend Framework 1.5.

Zend Technologies, Inc., the PHP Company, today announced the availability of version 1.5 of Zend Framework, the popular open source PHP framework [...] Additional features in Zend Framework 1.5 include support for several new services and enhancements to already popular features that make building modern web sites easier and faster than ever.

Updates include changes to Zend_Form, Zend_Layout, the LDAP authentication component, an update to the Lucene support, more Ajax functionality and much more. There's also a new service Zend has launched to provide more "official support" for developers/companies using the framework. You can find out more information about the service here.