I remember in the late 90's buying a Palm Pilot for my wife because it was the latest thing out there for organizing one's life! Organizing is a very general term and definitely means that the Palm Pilot could claim to be a general device.
The razor blade concept was just as true for the Palm Pilot at that time as for the razor manufactures. I think we spent more on replacement pens for that Palm in the first year than the entire cost of the Palm Pilot and it's accessories. WIth the iPhone we now have a device that is one thousand times more powerful than the original Palm. And to think that it is totally accessible to the Blind is absolutely awesome!!!