PodLockis secret partition only prevents casual observers from gaining access to your iPod data. The company recomends using the file encryption features of FileVault which is included with Mac OS X.
Additional features of PodLock include optimization using PodLockis defragment tool, backup and restore on the primary iPod volume, managing photos and voice recording, and displaying technical information about the iPod.
The utility retails for US$39.97. A working demonstration is available at the companyis Web site.