This is a MOSS/WSS application for examining a site's content to see if it complies with a set of rules that you may configure. Compliance rules include tests such as "Are required documents loaded in the correct libraries?" and "Do they have correct metadata (e.g. Approved)?" and others.
This project offers a good example of building and deploying a low/medium-complexity application on MOSS. The solution includes custom site columns, content types, web parts, list templates, list instances, web part pages and feature receivers.