Whether he has endangered lives or not is still a matter for debate.
However:
http://hotair.com/archives/2010/07/26/pentagon-review-no-troops-endangered-by-wikileaks-documents/
An ongoing Pentagon review of the massive flood of secret documents made public by the WikiLeaks website has so far found no evidence that the disclosure harmed U.S. national security or endangered American troops in the field, a Pentagon official told NBC News on Monday…
David Lapan, deputy assistant secretary of defense for media operations, told NBC News on Monday that a preliminary review by a Pentagon “assessment” team has so far not identified any documents whose release could damage national security. Moreover, he said, none of the documents reviewed so far carries a classification level above “secret” — the lowest category of intelligence material in terms of sensitivity…
While the team so far has not found any that would meet any of those criteria, Lapan noted that WikiLeaks has yet to publish all the documents it claims to have. Moreover, the Pentagon review has been stymied by the fact that, for at least part of the day Monday, the military team was unable to access WikiLeaks.org — apparently because of the heavy traffic it was receiving. In effect, the Pentagon analysts were unable to read classified government documents that had already been posted and read by the general public around the world.
Further:
Daniel Ellsberg, a former US military analyst, has described the disclosure of the Afghan war logs as on the scale of his leaking of the “Pentagon Papers” in 1971 revealing how the US public was misled about the Vietnam war.
“An outrageous escalation of the war is taking place,” he said. “Look at these cables and see if they give anybody the occasion to say the answer is ‘resources”. He added: “After $300bn and 10 years, the Taliban is stronger than they have ever been … We are recruiting for them.”
However, the equivalent of the Pentagon Papers on Afghanistan – top secret papers relating to policy – had yet to be leaked, he said.