Nagios is a great monitoring tool. Basically you can take the raw product and have it up and running within the hour. You need to remember the scope of your viewers. Having a dashboard with number is not going to fly with management. Management needs information now and cannot afford the luxury of digging through your nagios dashboard to obtain information (do you really want non-IT people looking through an application that shows the status of every server and service in your environment?).
Nagvis is the tool you need to add meaning to your nagios installation. Organizations have diagrams pertaining to various systems, so you need to add meaning to those systems for management. I have found the perfect solution to creating those diagrams. Simply export the diagram in either “tiff” or “png” format and use it as your background.
You will gain instant user acceptance because these are the diagrams management has already accepted to represent the system. Remember, when you add a service or host to the diagram do not include a label. Let the diagram server as your labelling.