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What you also learn is that this was a brilliant move by Apple. Outsource the development, reap the benefits. This was already known, but I would be interested to see how this these numbers stack up against Apple's internally developed applications (cost to produce, and revenue generated).
Not a brilliant move by Apple, remember that it was the community that asked for this, Apple didn't make a move, the community moved Apple to this direction, Apple wanted people to write webapps instead of using a SDK.
In my opinion Apple had an App Store planned out from the very beginning, and just hadn't finished the public APIs and SDK.