Hi Jeff,
You can check out "File Storage Resource Manager(FSRM)" which I think fits this requirement.
DFM in conjuction with NetApp Host Agent residing on Windows, Linux or Solaris workstations/servers monitors the directories you specified and generates report that provides info like file space usage, last access, type of files(.mp3, .jpeg,etc).
For more details please see in operations manager guide chapter on "What File Storage Resource Management does" and documentation for NetApp Host Agent.
Cheers,
-Amir