iPod = Nautilus
Powerbook = Cendres
2nd Drive = Hayate
Generally, I try to find immortal names that last and sound stylish regardless of their context. The computer seems so much more stoic that way =D.
Oh, and if I ever get a G5, I'm going to name it Chewbacca because some guy on Macrumors made a joke before the G5 was officially dubbed a "G5" that Apple should leave behind the old naming scheme and go with something completely um... different.