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I understand that the word may be abused, but even I have used the word 'synergy' to describe what I'd hope for when joining a new team of engineers - I'd want a well organized, cooperative team of people to work with.
I guess it's all about the context.
Distance in meters displaced per second by a point on the sphere perpendicular to the axis of rotation = (600,000,000 * PI * 0.000004) / 60 = 125.6m
Library of Congress shelf space = 850km.
Therefore, 0.000147839654287 Library of Congresses per second
Any freight carrier going (at a proposed) 4000mph (forgive me if I misread the theoretical estimates -- which are innately theoretical) will benefit any shipping carrier like Amazon. At these speeds, I don't think perishable cargo would be a limiting factor.
I think it would be a much better replacement for freight trains and trucks. I'm guessing that may be their goal but they don't want to upset the train and trucker unions just yet. I'd say Amazon should get it on this as well to speed up their shipping times and hit their same-day delivery dream.
Servo Controller (if you need more than the 8 provided with that particular robot controller): http://www.pololu.com/catalog/product/1356 - these can be hooked up to the robot controller's serial interface and daisy-chained for a maximum of ~255 servos
Perhaps if you live in a densely populated center with good public transportation or if you can actually afford to live where you work. But for most, this is not an option. It is also not a solution.