This document describes how to set up Hyperic HQ on Ubuntu 7.04. The resulting system provides an awesome, web-based "Systems-Management-Software". It's the further stage of classical monitoring and able to manage all kinds of operating systems, web servers, application servers and database servers.
I can't list all the features in here, so please take a look at http://www.hyperic.com/products/hq_oss.html. Hyperic HQ is licensed under the GPL. This howto is meant as a practical guide; it does not cover the theoretical backgrounds. They are treated in a lot of other documents in the web.