Here's a recent report from the Sunni insurgency in the Guardian:
Like Abu Omar before him, Abu Aisha, a mid-level Sunni commander, had come to understand that the threat from the Shia was perhaps greater than his need to fight the occupying Americans. Abu Aisha fought in Baghdad's western Sunni suburbs, he was a former NCO in the Iraqi army and followed an extreme form of Islam known as Salafism ...
On his mobile phone he proudly showed me grainy images of dead bodies lying in the street, their hands tied behind their backs . He claimed they were Shia agents and that he had killed them. "There is a new jihad now," he said, echoing Abu Omar's warning. "The jihad now is against the Shia, not the Americans."
Jeff Weintraub comments here.
(Photo of detained Sunni man by Chris Hondros/Getty.)