The famous quote from the Zaino site is "Best of all, Zaino Show Car Polishâ„¢ creates an award-winning finish without the use of abrasives or harmful silicones." That statement has both made people fearful of products that contain silicone, and also raised the question as to whether it means that Zaino contains silicones, just not harmful ones.
As Black240SX mentioned, I believe it was David B. himself that said that all sealants (perhaps Klasse as an acrylic is an exception) contain silicone polymers, however, that statement was made prior to the emergence of the WOWA sealants (Zaino Clear Seal, Optimum Opti-Seal, Ultima Paint Guard Plus).
EDIT: Since I'm sure someone is going to ask me if by my above statement I am inferring that WOWA products don't contain silicone, I'll answer in advance that I don't know about the silicones, but my theory is that WOWA products are made from ground up windshields of alien space ships from Area 51, or at least some chemical that is available to all three mfrs. and has recently become available, due to their similarity and proximate date of release.