Central index of files on workstations
It'd be useful for many if the agent could upload an index of files from selected locations (Say My Docs, Desktop, etc) to the server so that admins could perform a search for missing documents etc.
In the future, you could build on this to provide a sharepoint-style enterprise search centre that catalogs workstations aswell as servers.
You can do something similar now using custom inventory rules. As an example, we use the custom inventory rule to return a list of local administrators:
ShellCommandTextReturn(net localgroup Administrators)