If I remember right Cogent had blackholed the entire Sprint IP space, rather than routing it out through another provider. This led to the 'divide' of the Internet.
"I believe Apple is missing out on a golden opportunity...How many IT pros use Macs at home or buy them for the family? Isn't this a perfect target audience?"
Steve Jobs said two years ago that X is brain-damaged and it will be gone in two years. He was half right. -- Dennis Ritchie