Check out Gyroscope, Placebo and Rage against the Machine. Played at the BIG DAY OUT this year, brillian. Gyroscope are a great Western Australian band. Also for some more Aussie bands check out Little Birdie, Missy Higgins, John Butler Trio, Eskimo Joe, Grinspoon, Regurgitator, SilverChair (their old stuff), The Whitlams, and Wolfmother.