Some light reading (I look at wd40 like the spinning wing duck decoy, I don't need either of them to get the job done.) :

WD-40 - Wikipedia, the free encyclopedia

snopes.com: Uses for WD-40 Spray Lubricant <-- be sure to read to the bottom of this one

And the cream of the crop: http://www.mobile-shop.com/parts/msds/P80_WD40.pdf