The website, comcast.net, has been hacked on Wednesday night. The Register included a screenshot of what the website looked like when it was hacked. After two hours, users who visit the site are shown a “page under construction” message.
KRYOGENIKS Defiant and EBK are the names of the hackers according to The Register.
“There is still a lot of speculation about the details of this and why this happened. But it is clear now that a group of people (according to the hacker’s message) somehow rerouted the IP and DNS values of Comcast to an off site. (http://www.freewebs.com/kryogeniks911/),” said a Comcast user, Chris.
He added that, “It appears there was no malicious codes or script being run but a lot of people are saying that ports were being ‘listened’ to which could have led to the compromising of username/passwords.”
Source: The Register

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This has scared a lot of people. They could have intercepted passwords to email etc but its unlikely. I guess comcast was warned about dns issues for a while and decided to do nothing.