Sad news indeed. One may or may not like their brand/products but he had a real hand in revolutionising the tech world and brought personal computing forward in leaps and bounds.
Good eulogy here:
http://gizmodo.com/5838847/steve-jobs-is-dead
Like it or not, he totally raised the bar for what users expect in an interface.
A sad loss to the world of Computers, he had battled long and hard and when he stepped down recently I feared the worst. Will be interesting to see how the company fairs without him.
A sad loss indeed. R.I.P.