Well, I had to do a little bit of my own Google searching, but I tracked down the first time I used the term "Goldman's Law," back in another comment thread on the Whatever. Again, it was commenter Patrick M. who got the ball rolling with Vizzini's line that
Australia is entirely peopled with criminals
in comment #68 of this thread. Mr. Scalzi and I piled on in comments 74 and 75, leading me to coin the term in comment #95.