An old e-mail about the various uses of WD-40 (some of them contradictory!) including the myth that it's fish oil based, has started doing the rounds again recently.
(Incidentally, potentiometers and wave-change switches do
not feature!)
It's been de-bunked by Snopes but they
have also listed the uses that it
is suitable for.
So, take a look here:
http://www.snopes.com/inboxer/household/wd-40.asp