As usual, great tutorial.
Edit: I found that if I quit the Explorer process and restarted it, I did not need to reboot.
Edit 2: Shawn, I noticed that the registry value does more than just remove My Computer from the navigation pane. It also removes the icon from the desktop, even when the box is checked. I rebooted just to make sure the problem was not caused by quitting explorer and restarting it, with no success. I entered the enable value and My Computer magically reappeared.