This device makes your USB hard drive network accessible. It also has a print server, a built-in FTP server (so you can login from anywhere in the world and download or upload files) and, as far as I know, it also has a torrent server!
A one-port one is also available for £24.14.
If you are registered on AV forums (with 10 posts) you get free delivery.
A 'review' of this device can be found here:http://www.automatedhome.co.uk/New-Products/Addonics-USB-Network-Attached-Storage-Adapter.html
The USB NAS Dongles allow regular USB HDD Enclosures or Portable Storage Units to be converted to work as Network Attached Storage (NAS) Devices. Once the unit has been configured, any user on your network can share and back up their documents, pictures, video and audio files.
Supports live device status monitoring via web browser & device software
Supports USB1.1/2.0 (Hi-Speed) specification
Supports 802.3/3u transceiver
Supports MDI/MDIX auto crossover function
LED indicators for Ethernet connection
Supports up to 3 SPI interfaced devices simultaneously
Supports Ethernet protocols TCP/IP, WSD, UPnP, Bonjour
Supports USB External HDD Enclosure, USB HDD Media player
Interface: 1x 10/100 Base-TX Auto MDI/MDIX, 4x USB2.0 Type A Female
Data Transfer Rate: Up to 5MB/s
Power Supply: 5V 1.2A
Supports FAT 32 and NTFS HDD Formats
Supports Plug & Play feature