I grew up in Aus - then went to the US for college and haven't really been back since (5ish years) until now - for a short holiday. I've been trying to sniff out a startup scene in Sydney and Melbourne and cannot find one. In fact there's a general dearth of creative ambition: why would you want to do anything other than be a Doctor, Lawyer or Banker is the attitude of the most ambitious people I've encountered...
Yeah, it would be great if there were tech companies like Atlassian, Campaign Monitor, RetailMeNot, 99 designs (launched in Australia...relocated to California) being started in Australia. I could go on...