Another option, probably not as elegant though, is to copy your entire HD contents to an external device (a Zip disk or CD-R is good), find a USB Zip drive/newer Mac to copy the contents to USB/CD etc. You don't need an "image" as such of pre OS X installs, just a reliable method to get the data preserved from one old standard to a newer one

I'm considering putting a PCI SCSI card in my Hackintosh for these purposes, I doubt it'll work in OS X, but Windows would do it.