The 614 area code. There's a big clue for investigators, as hacker group LulzSec, which has been in the news a lot lately over various hacks (1, 2, 3, 4, etc.) has created a telephone "hotline" which people can call to request a hack.
The "Dial-a-Hack Hotline" is at 614-LULZSEC. LulzSec Tweeted the number nearly a day ago, saying that the group was:
Now accepting calls from true lulz fans - let's all laugh together at butthurt gamers. 614-LULZSEC, accepting as many as we can, let's roll.
That area code is specific to Columbus, OH in the United States. It is doubtful that the phone number could be used to track them down; they aren't that foolish.
On the other hand, those who call the number might put themselves at risk with authorities. Although we believe there's no way that LulzSec exposed itself with this phone number, those who call and leave a suggestion that is later executed might find themselves visited by the FBI at some point.
Those who have called the number so far have been greeted by one of two voicemail messages. One is answered with a faux French voice, purportedly of someone named Pierre Dubois. That message says, "Bonjour, this is Pierre Dubois. Leave me a message after the beep and I will get back to you."
The second says, "This is the voicemail box of Pierre Dubois and Francois Deluxe. We are not available right now as we are busy raping your Internet. Leave a message and we will get back to you whenever we feel like."
Those voicemail messages can be heard, below.
Reportedly, LulzSec has already hit 8 targets suggested by callers. It also hit Escapist Magazine, Eve Online, Minecraft, and League of Legends. The latter three are online games; Escapist is a gaming-related magazine. In response, CCP Games, makers of Eve Online, took all its systems offline, just in case.
These attacks were all part of a campaign called "Titantic Takeover Tuesday."
On Monday, LulzSec hacked into the U.S. senate.gov website, as well as Bethesda Softworks (another gaming company). It later published data from both to pastebin.