Jobs had handed off day-to-day operation of the company to his principal deputies some years ago, so his medical problems have not greatly affected the firm's success. Apple stock, valued around $120 per share when he took his 2009 medical leave, hovered just below $340 today, though it dropped a bit more than one percent during the presentation.
"I don't know if you can read very much into Jobs' appearing at the conference," said Tim Bajarin of Creative Strategies, Inc., a consulting firm that follows Apple developments. "We know he's been at Apple's offices. Even though he's on medical leave, he's still very much involved."
Jobs also remains a rock star of the technology world. His authorized biography, "iSteve: The Book of Jobs," by former Time magazine editor Walter Isaacson, is not due for publication until next March, but Amazon.com is taking preorders, and Amazon reported it was ninth on its list of 100 bestsellers this afternoon.