Source : Free On-Line Dictionary of Computing

Good Thing
     
         (From the 1930 Sellar and Yeatman parody "1066
        And All That") Often capitalised; always pronounced as if
        capitalised.
     
        1. Self-evidently wonderful to anyone in a position to notice:
        "The {Trailblazer}'s 19.2 K{baud} {PEP} mode with {on-the-fly}
        {Lempel-Ziv compression} is a Good Thing for sites relaying
        {netnews}".
     
        2. Something that can't possibly have any ill side-effects and
        may save considerable grief later: "Removing the
        {self-modifying code} from that {shared library} would be a
        Good Thing".
     
        3. When said of software tools or libraries, as in "{Yacc} is
        a Good Thing", specifically connotes that the thing has
        drastically reduced a programmer's work load.
     
        Opposite: {Bad Thing}, compare {big win}.
     
        [{Jargon File}]
     
        (1995-05-07)