Did you ever wonder why you go to the "Start Menu" to put your Windows PC to sleep, etc.?
Here's a rant about the unusability of the Start Menu and how it could be fixed: Choices = Headaches.
Here's a salient description of how the aforementioned rant was made possible/inevitable: The Windows Shutdown crapfest. (With a brief follow-up)
Addendum: The Design of the Mac OS X Shutdown Feature