Zend Server provides a development framework to give developers and system administrators an enterprise class option for PHP application deployment.
Zend Server has a Dashboard to show you the current status of your server.
Compared to digging through the plain text error file, the log viewer with search functionality is a convenience. It would be nice if it had more insight into the errors and could sort or perform field based filtering, though.
Here is where you can configure the monitoring rules. If you have a monitoring infrastructure in place, Zend Server will not hook into it, unfortunately.
It is easy to adjust the settings for the various components.
Likewise, changing the settings buried in php.ini are easy as well.
Being able to connect a debugger to Zend Server is a very important feature for developers.