So some of us have moved to Windows Vista, a few teething problems but are please with some usability improvements.
For instance the most obvious to note is that you no longer have to start in order to 'shut down'.
As a user of Windows XP you had to select the 'Start' button to shut down the machine, which always seemed a bit of a misnomer to me. However Vista improves on this by only showing the icon button.
Windows XP - Start it up then Shut it down
Windows Vista - Shut down
Although I still found myself hunting the 'shut down' option and inadvertently selecting the globally recognised symbol for stand-by.