Petraeus to take Afghan lead from McChrystal - washingtonpost

"Today I accepted Gen. Stanley McChrystal's resignation as commander of the International Security Assistance Force in Afghanistan," Obama said in an appearance in the White House Rose Garden. "I did so with considerable regret but also with certainty that it is the right thing for our mission in Afghanistan, for our military and for the country."

Obama said he did not make his decision based on any policy differences with McChrystal or "out of any sense of personal insult." - Petraeus to take Afghan lead from McChrystal
'Right decision for national security'

Gen. McChrystal's resignation statement (.pdf)
The Runaway General Rolling Stone Politics - Michael Hastings

Capitol Hill shows bipartisan support for decision
CBS News - MiamiHerald.com - Wall Street Journal