Turning a PC into a Firewire-Based SAN?

Rachovenov asks: "So I've finally plunked down the money for one of those new, shiny Powerbooks, but they don't have much storage. My old PC is just sitting here with 2 identical 250 gig disks spinning away and an empty firewire port. There's even a hardware RAID controller in there somewhere. So why not use it as a low cost RAID 1 array for the Powerbook when I'm at home? Has anyone done this? How could I make it so that Mac OS X just sees it as a couple of Firewire drives?"