ADAM Internet has effectively given users double the data allocation for free. As of May 15th 2009 they introduced Peak and Off Peak data.

If a user is on a 20gig plan, this now applies to the peak period (8am - 12pm) and they now also receive another 20 gig off peak (12pm - 8am) for free.

It's nice to see an ISP giving something for nothing for a change http://adam.com.au