Just to clarify, Comcast's announcement about limiting bandwidth came after the FCC's order to stop fucking with users. The FCC's problem was a net neutrality issue: it's (probably) OK for Comcast to limit bandwidth, just not treat different kinds of traffic differently. Since they were only limiting peer-to-peer traffic the FCC had a problem, but now that they're limiting everybody's traffic they'll probably be fine. I found it interesting that one of the three entities suing Comcast is Vuze Inc., maker of Azureus, a piece of software that I officially know nothing about.

Getting back to Comcast, I this would be a pretty clear case of you-get-what-you-pay-for (ie. if you want more than 250GB then pay more or go to someone else) except for two facts:
1) Comcast is either the only available broadband provider or one of very few choices for most of their subscribers.
2) Comcast is also a monopolistic supplier of on demand high definition TV, which is pretty much a direct competitor to internet video services like Vuze.

Viewed in that light, it's pretty obvious that Comcast is just leveraging its control over your broadband to keep its VOD service free of competition. The 250GB limit means that a normal user looking at MysteryPig and watching Youtube videos will never have a problem. But use your net connection to stream HDTV from someone competing with Comcast and you'll find yourself shut down in just a couple of days. It's pretty clearly a monopolistic, anticompetitive practice, and the FCC should really have something to say about it.

Here in Australia our provider gives us a limit of 3gb/month. Also, cool news section on Grandview's website.

Is that 3GB upload? Download? Total transfer? And do they have some software so you can monitor your usage? Do they cut you off if you go over? Or just charge extra fees?

A 3GB limit seems pretty low. My TV watching needs alone would burn through that in a week or two.