I feel that the compelling contribution to society of Steve Jobs was bringing to the computer market products with innovative design.
There is nothing in the world that works like a Macintosh computer. Try as they have, nobody in the PC world has come close to emulating the user friendliness of the "Mac". Each and every product from Apple has represented a leap forward in design and functionality. Each product (from computers to iPods and iPads) is invariably (and unsuccessfully) emulated by Apples worldwide competitors. Even the packages in which Apple products are shipped are innovative, attractive and extremely clever.
Paying attention to design is, in my opinion, the single most important contribution by Steve Jobs.
As an unrelated and amusing aside, I read this week the following:
"Ten years ago we had Steve Jobs, Bob Hope and Johnny Cash. Today we have no jobs, we have no hope and we have no cash."