This is probably a bad thing .... saw one thing that of course led on to many others. Where do you stop???
Saw this recently: http://www.cyberguys.com/product-details/?productid=36218
couldn't find any info on hacking it though :(
From the product page:
Share your external hard drive with your entire network--even the Internet if you want--with the simple-to-setup Venus mini-NAS Adapter. It accepts any USB 2.0 drive and serves it to a 10/100 Ethernet network. Select the servers you want to run--such as FTP, HTTP or SMB--connect the drive to the adapter, and then connect the adapter to a network port.
Drive formats supported: FAT32, EXT2, EXT3
Server software: FTP, DHCP, SMB, print, BitTorrent
Through Amazon, appears that Hitachi is offering something similar:
Doing a quick search looks like is promising as far as hacking possibilities.
This also looks pretty cool ... http://bifferos.bizhat.com/