Source : Free On-Line Dictionary of Computing

source of all good bits
     
         A person from whom (or a place from which)
        useful information may be obtained.  If you need to know about
        a program, a {guru} might be the source of all good bits.  The
        title is often applied to a particularly competent secretary.
     
        [{Jargon File}]
     
        (2001-01-27)