"Soft-Off" power buttons, which I seem to recall showed up with Win95, are the bane of my existence. I miss having an easily-accessible thing on the front of my PC's case that would turn off the power to the MoBo. When I tell a machine to turn off, I don't want it giving me any lip; I want it turning off. This is the first step towards SkyNet, mark my words.
EDIT: Think about it: "Soft-Off" power buttons impose a software layer between the button and the power supply. You are not turning off the computer, you are asking the computer if it would like to turn off. This doesn't sit right with me, one little bit.