The regime's actions caught everyone's attention, but that's one we know about. There is reason to believe that other such actions have taken place, but of course because the international media is not given access, not allowed into the country, not able to move around freely, the suspicion has to be that other such action by the shabiha militia or even by the regular forces of the regime has taken place.
On the rebel side, there are reliable reports of executions. I don't know if any of you were watching 60 Minutes the other night. They showed a video of an execution of captured soldiers by a militia force. They were made to kneel on the ground and then machine-gunned. That would, I think, probably constitute a war crime. I'm not an expert, but it would be my assumption that it is.