I’ve been thinking about buying an external FireWire drive for my G5 iMac. I’ve been researching the build-your-own type with an enclosure kit and a drive.
Turns out there are tons of enclosure kits available, some as cheap as US$30-40. With HDs being so cheap these days (TigerDirect just had 160GB drives on sale for $50 with free shipping), this is a great way to go. CoolDrives (who sells the enclosure seen here for $39) sells an enclosure (Firewire/USB2.0) plus a 200GB HD for $119. Just slap the drive in the case, plug it in, and you’re good to go.