NSA spying without a warrant more vast than originally reported

From the NY Times:

The National Security Agency has traced and analyzed large volumes of telephone and Internet communications flowing into and out of the United States as part of the eavesdropping program that President Bush approved after the Sept. 11, 2001, attacks to hunt for evidence of terrorist activity, according to current and former government officials.

The volume of information harvested from telecommunication data and voice networks, without court-approved warrants, is much larger than the White House has acknowledged, the officials said. It was collected by tapping directly into some of the American telecommunication system's main arteries, they said.

...A former technology manager at a major telecommunications company said that since the Sept. 11 attacks, the leading companies in the industry have been storing information on calling patterns and giving it to the federal government to aid in tracking possible terrorists.

"All that data is mined with the cooperation of the government and shared with them, and since 9/11, there's been much more active involvement in that area," said the former manager, a telecommunications expert who did not want his name or that of his former company used because of concern about revealing trade secrets.

...Historically, the American intelligence community has had close relationships with many communications and computer firms and related technical industries. But the N.S.A.'s backdoor access to major telecommunications switches on American soil with the cooperation of major corporations represents a significant expansion of the agency's operational capability, according to current and former government officials.

Phil Karn, a computer engineer and technology expert at a major West Coast telecommunications company, said access to such switches would be significant. "If the government is gaining access to the switches like this, what you're really talking about is the capability of an enormous vacuum operation to sweep up data," he said.

Does anyone else find this particularly troubling?