Do you have Comcast? Do you have trouble with P2P transfers? You may want to read this:
Comcast's network management practices (1) only affect the protocols that have a demonstrated history of generating excessive burdens on the network; (2) only manage those protocols during periods of heavy network traffic; (3) only manage uploads; (4) only manage uploads when the customer is not simultaneously downloading (i.e., when the customer's computer is most likely unattended) ("unidirectional sessions" or "unidirectional uploads"); and (5) only delay those protocols until such time as usage drops below an established threshold of simultaneous unidirectional sessions. Although network management practices must respond to new technological developments and necessarily change over time, Comcast to date has not found it necessary to manage traffic associated with downloads, or bidirectional traffic (i.e., uploads that occur at the same time a customer is downloading). P2P file uploads that are underway before the network management threshold is reached are not interrupted, and neither bidirectional file transfers nor downloads--including new ones--are affected. This action is nothing more than the system saying that it cannot, at that moment, process additional high-resource demands without becoming overwhelmed, just as a traffic ramp control light regulates the entry of additional vehicles onto a freeway during rush hour. One would not claim that the car is "blocked" or "prevented" from entering the freeway; rather, it is briefly delayed, then permitted onto the freeway in its turn while all other traffic is kept moving as expeditiously as possible, thereby ensuring order and averting chaos. This is an appropriate analogy to Comcast's management of P2P unidirectional uploads.
Its impossible to know whether the methods they claim they use to throttle traffic are in fact the only methods they use, but what they describe doesn't sound too bad to me.