Very controversial (as is Verizon's penalty for exceeding a reasonable "unlimited" threshold on their wide-area wireless service), but consider the limits; I saw another article this morning suggesting what Comcast is contemplating would be, e.g., 11 hours of Internet video a day...
Jennifer Khoury, a company spokeswoman, said Comcast is "currently evaluating this service and pricing model to ensure we deliver a great online experience to our customers."
Comcast describes excessive users as those who send, for instance, 40 million e-mails or download 50,000 songs a month.
One option is to cap the bandwidth usage at 250 gigabytes per month. If the 250 gigabytes is allotted for just downloads, that's enough to handle about 50 high-definition movies, 250 standard-definition movies or more than 6,000 songs every month.
If users exceed that cap, they could be charged $15 for every 10 gigabytes they go over.