Over at Daring Fireball Gruber notes:

Icon for the Save button is still a floppy disk, despite the fact that Apple hasn’t sold a machine with a floppy drive for a decade.

So what do you suggest they put there John?  It’s a well-known icon regardless of platform 8-year olds not withstanding.  I suspect the 8-year olds probably haven’t used a manila folder either yet the open manila folder is a standard icon for opening files.