fun test of technology but I wonder what use this would solve better than a quad copter (or more) regarding stability in high winds and carrying load. maybe going into really tight spaces?

Lily-Throw And Go-Auto Tracking Camera Quad Copter has been added as a related post - related requested by newtboy.

I'm thinking around 4 load-carrying quality quad copters and significant battery expansions.

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So many potential problems with this.

Security while traveling in airspace.
Getting FAA clearance.
A collection of plastic delivery bins that are not as easy to recycle as the standard corrugated cardboard boxes.
Theft of really, really cool quad copters.
Battery life of quad copters probably really limits the radius of travel for deliveries.
Amazon would have to build way more processing centers, making costs go up.
etc...etc...etc