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I was online looking for bird netting to cover my huge blueberry bushes
(category: fat chance), and came across this millipede dust.
http://www.betterpestcontrol.com/products3.html
It's item # 29135 (next to last on a looong page) and is on sale. It is
supposed to be a waterproof powder that keeps millipedes out. Probably
fairly toxic, but man, I hated that crunch, especially in bare feet in my
bathroom at night! EeeEeewwww!
HTH, laurie (Mother Mastiff)