While reading through the Slashdot newsletter I stumbled on an entry about hacking the Linksys NSLU2, which was a two part article on how to access a backdoor on the network storage device and modify it to support ssh, nfs and pretty much anything else you can think of as it runs a Linux OS. A real interesting read and an insight into the approach taken to get around the security of this device. You can read up on even more information here.