Well the image pretty much speaks for itself, I reckon. I suppose you could fix it up to actually run on steam, but that’s way too over-the-top. There is one slight dig at Valve Software, so I hope they don’t suspend my Steam account (I need my Peggle fix to function).
Steam Clock
Dave's Geeky Ideas 
And it’d be neat if it had an alarm function that if set to 5:00, it would trigger a recording of the ” ‘quittin’ time!” steam whistle - ala ‘The Flintstones’.