Multiipedes love Tasmania's north east coast which is not a problem as they are part of the ecosystem and feed on silverfish and slaters. So they keep pests under biological control. Centipedes and millipedes, are however, not nice to make personal contact with, so I usually pick them up with a bit of torn off newspaper, squash them,(not easy as they curl into a defensive spiral and are quite brittle), and throw in the bin.
Trying to eradicate them from the human domain is pointless as they will return anyway. They love it if you are sited down from a watercourse and there is mulch around the dwelling. Apparently they are most active in Autumn and hibernate in nests at other times. I have never known them to be completely out of sight except during short periods of cold weather during Winter, but there are usually at least a few sighted every week or day during warmer and or wetter weather. Today, for example, I have already disposed of 2. They range from very tiny to 3 or 4 cm as they can be up to 5 years old. I feel comfortable about killing multipedes as I believe they have no developed nervous system enough to feel pain and also as I do not use chemicals or pesticides. Also, plenty remain to continue their ecosystem function controlling insects, as I already mentioned. My multipedes could be either Tasmanian natives or Portuguese introduced, so are likely harmless to humans. If they were South American(which they are not), they might be a type that squirt poison and are harmful to humans.
Of course, it is everyone's nightmare that they would crawl up your nose while you are sleeping and they can rear up to climb off the ground, so keep bed linen above ground level by longer than maximum multipede length.
http://en.wikipedia.org/wiki/Millipede