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Although I'll probably use the suggestion from @sysop-dr Desktop for my own use, I'm sure many of my customers will be grateful for your idea of a toolbar in the future as they migrate to Windows 8. Many thanks.

If you like to have both Sleep and Hibernate available you can download PsShutdown from SysInternals and then use
"PsShutdown /d /v 0" for Sleep
"PsShutdown /h /v 0" for Hibernate.

The "/v 0" option simply stops it throwing a dialog box at you.