Seriously though, you honestly can't expect more than 250 GB per month for residential service. Those of you arguing about Blu-ray transfers and GB of backup data, shut up. Get a goddamn commercial line if you're not an average consumer.
Are you saying watching HD movies and backing up pictures/home video to Carbonite or something aren't residential activities?
Complaining over a 250 GB cap is like complaining that you can't run a 20,000 machine data centre at home off the city's public electricity grid.
No it's not. It's like complaining that my connection to the power grid can't support eight computers in my home, because the "average user" doesn't have eight computers. Who's to say, though, that I don't have a high-power desktop for gaming (1), a laptop for surfing, etc (2), a laptop for the wife (3), one laptop each for the kids (4, 5), one MythTV box each for the upstairs TV and the downstairs TV (6, 7), and a media server (running Windows HOME Server, not something Enterprisey) (8)?
Sure, this is a hypothetical example, but it's not at all unreasonable. The fact that I'm not "average" doesn't mean I should need a commercial-grade connection.