Log onto the Service Console of an ESX host which has access to all the LUNs you are wanting to search and type
find /vmfs/volumes -name delta
This gives a list of the snapshot files which that ESX server can see. A bit of scripting could be done to automate email a regular report.
As suggested I downloaded the VI Toolkit and PowerGUI. Once you have PowerGUI installed with the VM powerpack, the snapshot information is right there.
Thanks to everyone for the assistance.