Asking employees for ideas isn't a focus group or market research. Asking employees if they what they think about Idea A vs. Idea B is a focus group.
And as for the iPhone, recall that originally Steve's idea for apps was web apps, not a vibrant dedicated App Store. The whole idea for dedicated Apps came from "jail breakers" who were disatisfied with mere web apps. Funny how that worked out for Apple. Another example of taking other's ideas and cultivating it. Dare I say, the iPhone wouldn't be the same today if it only had web apps.
I don't know why so many of you think Apple's idea machine exists in a vacuum one 1 Infinity Loop.