If you can afford a SCSI2SD would be just great in a portable, I can just imagine how nice it would be not waiting for the hard drive to spin up...

And on the subject of portables, I can't believe this one was bid up to 610$ :http://www.ebay.com/itm/1989-Macintosh-Portable-M5120-/281771394368?hash=item419ae24540

I guess, a SCSI2SD in a portable is a pretty solid investment eh?