Barack Obama, via AllThinsD:

And there may be no greater tribute to Steve’s success than the fact that much of the world learned of his passing on a device he invented.

Larry Page, CEO at Google, via Goolge+:

He was very kind to reach out to me as I became CEO of Google and spend time offering his advice and knowledge even though he was not at all well.

Lakshan Perera, via LakTEK

Steve’s life was not bed of roses. As a child he was adopted, he had to drop-out from the University, was kicked out from his own company and lived the best years of his life battling with Pancreatic cancer. Yet he managed to “put a ding in the universe”.

Steve Jobs himself, in a speech at Stanford University:

…death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life's change agent. It clears out the old to make way for the new. Right now the new is you, but someday not too long from now, you will gradually become the old and be cleared away. Sorry to be so dramatic, but it is quite true.

He will be missed.