15 ways to Leave your Computer

http://www.joelonsoftware.com/items/2006/11/21.html

 

And add to that, the keyboard shortcuts like Win-L to lock XP machines and C-A-D and Lock Computer on Win2k machines. Personally, I have set power management options to hibernate my PC everytime I hit the poweroff button on the cabinet. I have a separate button for a hard reboot, and i use Win-L to lock my screen when I take an emergency break. Many many options less.