Take a risk; life is short

A great post, Death by Risk Aversion, about how great ideas become mediocre products. Kathy posits that management and bureaucracy are the barriers between great ideas becoming great products. My question is what about Apple? How does Apple, a big company, continue to develop "insanely great products?" I think the obvious answer is that Steve Jobs is a micro-manager who oversees every product that Apple puts out. I wonder if the obvious answer is the right one. Is there something Apple is doing culturally that lets its people take risks and lets great ideas become great products? Or is it just Steve dreaming up ideas and then executing them?