I recently had the task of moving four Cisco ASA 5540 devices from one location to another. The big headache I found was that no one remembered the Pre-Shared Keys for the tunnel groups. A simply show running-config shows only **** for the PSKs. A bit of digging on the Cisco site resulted in the following command:
more system:running-config
This will show all hidden entries in the running config as clear text.