Most of the major banks will offer these kind of deals on PPOR mortgages, typically you will pay 3 or 4 hundred dollars a year to get this. They tend to be called 'Professional packages'
ANZ call theirs Breakfree, you get 0.7% off std variable and 100% offset & up to five loans (IP & LOC etc) for no extra costs, so if you have a mortgage any cash in the offset is effectively earning you money at lenders interest rate and its not taxed at the moment at typical 40% tax rate, its worth about 7 or 8% pa
NAB do a similar deal, i think this one is called 'Choice'