Sleeper, I think it's good that you have boundaries better established. It will be better for the kids, too.
I do think the advice about treating them like business associate is appropriate. I also think it is healthiest for the kids--if you are too good of friends they want to see you back together.
M: 16 years Bomb 4/07 OW 20s long gone Divorced 11/09 I remarried New Guy Cooperative r w/X regarding D