The days of all-you-can-eat bandwidth appear to be numbered. AT&T, one of the largest broadband providers in the country, has set usage caps as an experiment in Reno, Nevada.
Under the plan — which became effective Nov. 1 — new AT&T broadband customers in Reno will be capped at 20 GB to 150 GB per month, depending on the plan. And later this year, existing AT&T customers will be subject to the same caps if their usage exceeds 150 GB per month, according to a document filed with the FCC by the company. Users who go over the limit, will be given a one-month grace period, after which point they'll be charged $1 for every GB they use over the cap.
http://blog.wired.com/business/2008/11/att-tries-usage.html