Optus leading the way in terms on Mobile Broadband data.
50GB+50GB = 100GB total for $70 a month with no lock in contract.
Month to month or can be contracted on a 24month deal with a modem.
Edit: I just bought one this afternoon. I can confirm it comes with TV and Music streaming free.
I'm close to ditching my ADSL for this type of offering.
CIS is here
From the CIS
Description of the service
This is a Postpaid Mobile Broadband Service which includes
a Data Allowance of 100GB for use within Australia. In times
where our network is busy, data usage on this plan will be
prioritised at a lower level than other data on our network. This
means that during busy times you will experience slower speeds.