While it can involve many things, such as peering without settlements and flat fee access charges, there is a simple interconnectivity definition that even telephone companies have agreed to, in the FCC approval of the Bellsouth merger. What if that definition were made to apply to all Internet access, including IPTV? Would that prohibit ISPs from offering selective faster access? No:

Consumers (and Internet companies, for that matter) have paid, should pay and will pay for faster speeds if they need them. Some will want Ferraris, and some will choose Fords. The point is that the consumer decides for themselves how fast and where they want to go. Without Net Neutrality, the phone and companies will set the speed limit and decide which roads their customers can take, while collecting exorbitant tolls. While they’re at it, they’ll inspect each vehicle to see who should be sent to the back of the line.

Net Neutrality Foes Run Out of Gas, SavetheInternet.com, 6 Feb 2007

The telephone companies say they won’t inspect and toll, but if not, why are they opposed to net neutrality?