Okay, I don't actually have Windows 7, so this may or may not have already been fixed. But in Vista, when you click Restart, Log Off, Shutdown, etc. there is no confirmation message. I think this is especially needed in Vista because in that little menu that comes up when you click the little arrow (see picture) the options are too close together. Its very easy to click the wrong option and accidentally restart your computer instead of logging off or something.
Bring back the pop-up confirmation dialogue that used to come up in XP and previous versions of Windows.