Australia: kilo plates, like most of the rest of the world.
It's one of the things that really annoys me with US based sites in that they are talking in lb when the vast majority of powerlifting done on the planet is in kilos. In fact, I would hazard a guess that any decent US federation would have their comps in kilos as that is the international standard, they just report it in pounds. It might have been elitefts that had conversion tables for US lifters for some comps.
Same with the Olympics. Everything is in kilos. US commentators find it irresistable to convert to pounds, making the whole thing an annoying experience.
The kilo standard is shown in the US lb plates. I mean, why 45lb? Why not 50? Why a 44lb bar and not a 45, or even a 50 or a 40? Because they are all near equivalents to the kilo standard.
Sorry for the rant. It's just a pisser having to deal with 18th century standards.