Hi,
Some of the zend dumps i came cross.

http://www.scribd.com/doc/8008516/Aghreni-Technologies-Zend-PHP-Training
http://www.scribd.com/doc/7302082/Sams-Zend-PHP-Certification-Study-Guide
http://www.scribd.com/doc/2868076/Zend-PHP-5-Certification-Study-Guide-1st-edition-Oct-2006
http://www.scribd.com/doc/7310845/NanobooksZendphp5Certificationstudyguide
http://www.scribd.com/doc/453149/Zend-PHP-Certificate-Practice-Testing-Book