RE: P factor
dtom,
I agree with you that the explination seems flawed and I believe that the right side of the prop (the down going blade) is operating at a lower AOA and the up coming blade is operating at a higher angle of attack (at least that's what I see when I draw it out). That being said, the lift generated by the down going blade will be greater because of the increased velocity moving over the blade. Think about a helicopter (clockwise spin veiwed from below) the right side is seeing higher velocity compared to the left side. In the case of our plane, since V is squared, a little lower AOA at a higher speed will create more lift. I think from what I've read the slip stream is a large factor in the yaw effect. This might help.
[link]http://www.auf.asn.au/groundschool/umodule11.html#tophenomena[/link]
Steve