In order to guide the customer, we need a tool/module that can monitor the disc- and SQL space usage on a solution. The tool should tell what data is using the space - so we can advice the customer to take specific clean up action. Maybe it could be structured like the statistics (files, modules, stylesheets).
Also we need a tool/module that makes cleaning up easier than the link management (one document at a time) - where we e.g. can see if a document/image/stylesheet is not used anywhere... Maybe a bit like Windows functionality "Unused icons on desktop"...