Because it is expected, even though it is all over the news: Steve Jobs.
Edited to add 10/6: Both John Scalzi and Wil Wheaton have nice tributes up at their sites.
ETA3: I generally don’t solicit charitable donations here. But I would like to note that the Lustgarten Foundation for Pancreatic Cancer Research gets four stars (the highest possible rating) from Charity Navigator. There are worse things you could do with your money than make a donation to them; if not in memory of Steve Jobs, perhaps in memory of Randy Pausch. Or Benoit Mandelbrot. Or one of the other 419 people whose death from pancreatic cancer was notable enough for Wikipedia.