I think a lot of people are thinking too much about their high school experiences with burning up strips of Magnesium, if the nano was to be made out of Magnesium, it would be as flame proof as any other metal/plastic and if the weight is decreased, this could be a nice bonus.
Plus, Aluminium is really energy consuming to make, before WW2, it was a luxury metal, one of the rarest and most valuable metals. With the oil price going up, it is hardly surprising that the Al prices go up too, and people start looking for alternatives
If the rumor is correct, and Apple is still Apple, this change will mean:
Lighter iPod Nano/Shufffle
Cheaper (relatively)
Sexier (according too previous posters)
More scratch resistant (this will be the case whatever material is used)
add these to a larger flash drive and a new sexy design, and the Argo will have no chance whatsoever
