This is one of the most dangerous spiders in the world. They live around Australia's largest city. They build funnel shaped webs under loose tree bark, in the grass, etc. When out hiking, watch where you put your hands!
As far as the most venomous spiders go, many agree that the Brazilian Wandering Spider, Widow Spiders, Australian Funnel-web Spider and the Recluse Spiders carry very potent vemon. However, no one agrees over which is the most deadly.