Howto: configure xinetd service
http://www.cyberciti.biz/faq/linux-how-do-i-configure-xinetd-service/
Configuring Apache for Maximum Performance
http://cloudservers.rackspacecloud.com/index.php/Configuring_Apache_for_Maximum_Performance
Virtual Hosts Permissions
http://cloudservers.rackspacecloud.com/index.php/Virtual_Hosts_Permissions
Multiple_Hosts_Layout
http://cloudservers.rackspacecloud.com/index.php/Multiple_Hosts_Layout
how to integrate doctrine 2 with Zend
http://www.zendcasts.com/unit-testing-doctrine-2-entities/2011/02/