NAB are currently offering 0% on PURCHASES for 15 months on their entire range of NAB credit cards. If you can get a decent credit limit, it's a great opportunity to sit some money in your mortgage or purchase something large at 0% interest. Cheapest card (no frills is $30per year), but they also have both Qantas and Velocity earning cards which both offer signup bonus Frequent Flyer points which work out at about equivalent to the cost of the annual fee for two years when used on a domestic flight.
The FF cards all come with an AMEX and VISA card and you can add a second cardholder for no additional cost to ramp up extra points.
The Velocity Rewards Premium Card seemed to work out the best for me based on my annual spend and the value of the FF points when it comes to earning and spending them. Results may vary though.
I wouldn't normally recommend a card that you pay a fee for, but the 0% on PURCHASES is a rare find. Also should be pretty easy for most people to then Balance Transfer this amount to another card at the conclusion if you wanted to extend your payment period.
I applied for it and got one but the credit limit they have given is very less. Anyway, still it's very good deal.