Get a $10 iTunes e-voucher when you register your Amex card and spend $20 on the Australian iTunes store between now and 12 April 2013. Limited to the first 13000 to register their card details with Amex Connect.
Note, this is limited to bank issued Amex cards only. I tried registering my ACS Amex gold card and was told the offer is only available for bank issued cards.
Wow for the first time they are actually enforcing the whole "only bank issued" thing.
(tried CPA and my Optom association cards)