Joshua Gans informs us that, at long last, an Australian ISP will be offering broadband without a monthly bandwidth cap. Here is something interesting that he says regarding why it hasn’t happened already:
I had suspected an adverse selection issue whereby the small percent of very high users would migrate to the first mover causing them disproportionately large costs.
The cost is $100/month on a two-year contract. But if it works (and the PR for this company will be good if nothing else), I can imagine other ISPs offering the same service before long.
Letters to Nature 
Finally!