Went to a rubber factory (not condom factory, mind you) few days ago for stocktaking as part of my job. The fanning powder that magicians use, is used in the industry to keep the latax sheets from sticking to each other.
So there you go.. a little general knowlegde for those of you show didnt know. :)
http://en.wikipedia.org/wiki/Zinc_stearate If im not mistaken, the same stuff is also used by gymnasts when they hit the poles and beams and stuff so theyre hands dont get sticky. :S
-NAdz