This thing is great. I got it from VTech Industries for about $220 AUD. It is basically a mini GNU/Linux server with 2 giant hard drives in it. That price gets you a single 1TB drive and you can install your own drive in the other bay by removing the lid and dropping it in place. The unit, pictured below, is a bit taller and wider than three PC hard drives stacked together.
It comes with a reasonable web interface you can access over your LAN, but I installed the fun_plug hack on it by copying the files across the network and restarting the device - easy. That hack gets you SSH access, rsync, and a bunch of other Linuxy stuff.
We are storing our media and backups on it and it is basically perfect for that use-case. I now once again have a cron-and-rsync based regular backup of all of my servers in the USA, hooray! I'm also routing all SSH traffic to our ADSL router through to it so I can access the files on the device from outside our network if neccessary.
All in all I am very pleased with this purchase.