Not much to say that Apple hasn't already said. The man is arguably one of the most important and influential people in his chosen fields. Yes, plural. He ushered in not just one revolution in his industry, which few enough manage to achieve, but multiple revolutions, in several industries, and in the lives of people everywhere. Personal computing, how we interface with computers, how we listen to music, how we tell stories in movies, and redefined our concept of how personal a computer can be with the iPhone.
He will be missed.
Rest in Peace, Steve.