Perhaps there's more going on than that page indicates, but, from the look of it, it doesn't actually expose the network functionality to the host CPU -- it just appears to the Empeg as a normal disk.
What would be cool, though, would be to use this to convert a Rio Central, or a Tivo, to use network-attached storage: have a hocking great RAID array off in your loft or somewhere you don't care about the noise, and Central or Tivo back in your living room has one of these in and just believes that it's a vast, silent, low-power local drive. (If you're thinking of doing this, check that it suppors LBA48 first.)
Peter