Netflix won't be doing any more quota-free deals with Australian ISPs, but if you're an Optus customer, today is the day that Netflix should stop counting against your cap.
We noted when the quota-free deals were announced that Optus would be offering quota-free Netflix, but that it wouldn't happen until well after Netflix itself launched. That date is today, so from now on if you're an Optus customer with Netflix, your usage shouldn't count against your cap.
That being said, at least early this morning Optus Fetch boxes were still displaying the quota-in-use message, so it may take some time to filter through.
It's also worth keeping in mind that the quota-free deal only applies to Netflix Australia, so if you're sneaking into Netflix US (or elsewhere), you'll still be whacked with a data bill if you binge too often.