The metator (somebody who adds metadata to the content) is an underestimated role in the business. Searching for the right content is getting more difficult each year and now is the time to do something about it. Create a role in your Webmanagers team who is responsible for tagging the content.
After this use a good search engine to resolve the quest for content. Use the metadata in the HTML and search for it using these metadata. Try to dvidide the content into workprocesses, region and employees role. This would be a great improvement. Not everybody has te see all content. Try to filter the search for content on these three parameters.
You can use the Dublin-Core metadata to complete the list.