HUNGRY
Simply enter HUNGRY at the checkout.
Expire on 07/Feb/2013
I received this by email from EatNow today, but this offer doesn't appear to be for their new customers.
(For their new customers, there is better $10 off ongoing deal - http://www.ozbargain.com.au/node/92339)
The email starts off like this "It's been a while since your last order and we are worried you are getting hungry!" so presume this code is meant to be used by hungry repeaters ;)
It doesn't mention any conditions such as "Download or update the iPhone App and order from the App" or minimum spend.
Well, this is only for $5 off, but thought I'd share it with the fellow OZBargainers :)