Steve Jobs' Greatest Invention

Adam Lashinsky writing for Fortune in an article called "Inside Apple":

Steve Jobs hired dean of Yale School of Management Joel Podolny to run the Apple University, an internal group also featuring business professors and Harvard veterans that are writing a series of case studies to prepare employees for the life at Apple after Jobs. These case studies focus on Apples recent business decisions and internal culture, they are exclusive to employees and taught by top executives like Tim Cook and Ron Johnson.

Steve's greatest invention was Apple itself.

Summary: Asymco.com
Full article: Fortune