[ubuntu] Share USB drive in Ubuntu Server?

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http://ubuntuforums.org – I have a server with a shared internal drive (not the same one that the system is on) and a 500GB external hard drive that is connected via USB and used for backing up and archiving. Right now I have a somewhat lean GNOME setup so that I can use Webmin to share the external. Having a GUI running on the machine is pointless and a waste of memory, however, since it's headless. I just want a command line server that I can maintenance from my Windows 7 laptop with puTTY. Could someone please describe for me how I would go about sharing the USB drive over my LAN without a GUI/Webmin? Thanks! (HowTos)