Reader Michael pointed me toward this helpful chart on dealing with aggression in a person with autism (click on the pic to make it larger). I like this way this breaks down the potential triggers and options for accomodation and then simplifies it so that anyone can understand and help.
They did leave off a few obvious triggers that any parent would know: fatigue, hunger and pain - which a child with autism may be unable to communicate well. Other than that, this thing is spot-on for helping them learn to self-regulate and providing them safe alternatives to deal with their feelings.
I was unable to find the original source for this after Googling the hell out of it - I did find it cited on several blogger sites but nobody's claiming they created it. If anyone knows the original source, please let me know so I can give proper credit.