User interfaces can be a frustrating thing when they change drastically. One of the first questions I had when I switched to Fedora 15 was:
“Now that I have Gnome 3 running how the heck do I power down my Fedora 15 box?”
The answer is to click on your username and when the drop down appears press the Alt key on your keyboard and the word Suspend changes to Power Off. Click Power Off and the system starts to shut down.
Powering down Fedora 15