I purchased my own copy of Mindjet for my personal and work use. At work, since I don't have others at work using the product, I cannot use the project management features. I use it as an amazing knowledge/documentation store.
We recently lost our accounting employee so I built a map itemizing all the responsibilities (day to day, monthly, special) with appropriate sub-topics with appropriate notes and attachment documents and videos explaining how to do each task.
For certain periodic tasks, I create a map showing the high-level workflow with notes and attached sample reports. The consumer gets the high-level view plus the details required to accomplish the task are just a click away. I export the map with HTML5, store the links in SharePoint so that the user always has access to the latest documentation (i.e. Sharepoint documents can change and the map reflects the latest changes).
This documentation helps the individuals understand their roles and gives them an aid in executing their responsibilities. Training a new Accounting staff member becomes much easier as their role is all laid out for them.