pretty much hits the nail on the head. there is no ambiguity or confusion in the floppy disk save symbol. it's immediately and universally understood. it works.
more importantly, why are we targeting the floppy disk here? when was the last time you used a magnifying glass to search for something? or looked at a stack of polaroid photos? and god knows why copy/paste involves a clipboard.
interfaces are full of references to antiquated physical devices. but that doesn't make them any less effective. can we move on now?
nail on the nail head
How to change the floppy disk icon is a nice academic issue, but I wonder if the discussion we should be having instead is, "how can we make the act of saving obsolete?"
I'm not sure why this "we need to make saving obsolete" argument has become so trendy. There are a vast number of situations in which giving the user the ability to manage their own discrete save points is important. Yep, auto-saving is great in some contexts, but it's not a panacea... far from it!