When Steve Jobs resigned as the chief executive of Apple on Wednesday, his note to the public and the Apple board was short and classy. The gist was this: “I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s C.E.O., I would be the first to let you know. Unfortunately, that day has come.”

As you can imagine, this news is rocking the world — and not just the tech world. Mr. Jobs, after all, has almost single-handedly reshaped a stunning range of industries: music, TV, movies, software, cellphones, and cloud computing. The products he’s shepherded into existence with single-minded vision read like a Top 10 list, or a Top 50 list, of the world’s most successful inventions: Macintosh. iPod. iPhone. iTunes. iMovie. iPad.