What it should do
Move items within a user specified date range and user specified application (e.g. Dates, Works, Notes) into a specified folder within that application.
What is the point of such an app
To move all old items into one director ready for export, archiving, and/or deletion.
How to do it
As a separate application that lets you set the date range, the application, and the target folder.
It might remember its moves in a store, and be able to undo or "Put away" the relocated items (where possible). A use for this would be to relocate a range of items to the folder, delete the ones you don't want, then "put away" the remaining items back to their original locations.
It is not currently under development