OpenSuse 11.1 user can use "1-click" installer - here or if you already subcribe to packman, go to yast -- software management and search for "gshutdown" (shown below)
After successful installation, go to terminal and fire the command # gshutdown and you should see something like ..
There are lot of other option that you can configure for shutdown.
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source:http://linuxpoison.blogspot.com/2009/02/135781757112811.html