techmuse writes "Comcast is considering the imposition of bandwidth caps and reductions in network bandwidth to customers who, while paying for the use of a certain amount of bandwidth, dare to actually use it! Gizmodo has more on the subject."
points out that it would take some pretty heavy usage (by current standards)
to hit the cap described. Bear in mind, too, that these reports are based on the word of an unnamed "insider," rather than an officially announced policy.