Have something like that for my son's computer. He says, I'll shut down in half-an-hour, and 2 - 3 hours later he's still at it.
The only trouble is that as far as I know there is nothing that could do that unlessthere is some sort of parental control that could be switched on in the O/S and passworded to prevent it being turned off.
Hope this makes sense...I'm looking for a utility that will automatically shut off the PC ( runing XP Home SP-2 ) at say 10:00PM. And can not be overridden by switching users or rebooting. My wifes son...My step-son has a habit of staying up till 3am chatting completely forgetting about needing to be up in 3 hours for school. I've looked at some software available and am not convinced that he could beat the system by just switching accounts. Any input would be helpful. Maybe something that would only shut down selected programs...AIM..My Space and the like.