Hi Slithy! I had a nagging suspicion that we did discuss something like this in the recent past, and would you believe it, was able to find the link in a jiffy, because of the high recall nature of the title! AnnaS, take a bow! If I remember right, the prior discussion ended somewhat inconclusively...

http://wordsmith.org/board/showflat.pl?Cat=&Board=miscellany&Number=90957