Came across this today, sign up for the Amex Platinum Card, spend $500 on your card and received 75,000 points (enough for a return SYD/HKG flight).
Here is the link
americanexpress-dot-com/australia/campaigns/platinumwish/index.shtml?PID=36&BUID=CCG&PSKU=660&AFFID=NEONDM&sourcecode=1CA183C001