This poor forum looked lonely. Anyway, this sorta fits here. This Here Link is to a developer article on the official D&D site. Don't let that put you off, it 's a humorous article about dice rituals, general as well as personal ones from various WotC folk. If you read nothing else, at least scroll to the bottom and read Mike Mearls dice rolling superstitions. Hilarious.
I don't really have any dice superstitions or rituals other than preferring black with white pips/numbers. I do, however, encourage them in my friends. It's funny what otherwise rational people will do when it come to dice.