Newsforge has an interesting article on FreeNAS which is an open source NAS (Network Attached Storage) server software.
In a nutshell, it is a 16MB application that converts a PC into a NAS server.
The good thing with it, as it is the case with most open source software is that it is free and can run on relatively old hardware.
With hard disk space at an all time low and data-retention laws forcing IT managers to manage even larger masses of information, the FreeNAS route is very attractive indeed.
Configuration is a doodle as is running it. You must however take care to follow the steps in the setup and user guide precisely.
FreeNAS is not without faults though. You must be at ease with command line and understand what is happening under the hood.
But at the end of the day, you might save yourself and your company a fair amount of money by recycling your existing machine into a NAS server.