Mike Allen at Politico has a great play-by-play account of the Obama administration initially hearing about and reacting to the Rolling Stone article that led to Gen. Stanley McChrystal's resignation.

"...Tommy Vietor, the assistant White House press secretary who handles national-security issues, had been e-mailed a PDF of the article by a colleague in the U.S. government. Vietor forwarded the PDF to a few officials who tried in vain to read the tiny type on their BlackBerries. So Vietor printed out a bunch of copies for the national-security inner circle. He walked one into Robert Gibbs' office and handed him a copy, with key passages marked."

Read the full account at Politco.