Guys just a thought, but if I can add to the original question of shutting down. If your going to use a prompt to shut down the machine...... why not link it to "xcopy" and back up some files along the way.
One of my original thoughts was to copy documents when i finished with the computer for the night, then i got sick of coming back an hour later to turn it off so I ended up linking the two together. My pc now has a single "backup" button on the quickstart menu that initiates the backup and then switches the machine off after its done. A few weeks after that paranoia got me, so I got it to creat a "logfile.txt" after each backup so i could check when it was last completed.