Watch for exceptions to the caps. Worries me. (Score 3, Insightful)

Comcast Video on Demand and VOIP will not be part of the cap (they use a slightly different protocol). Keep an eye out to see if Comcast allows other types of data to not count towards the cap.

For example if Comcast were to partner with Rhapsody they could say that their data would not could towards the cap. That would put other music download services at a disadvantage.

Or, for example if Comcast were to partner with Microsoft so that XBOX DLC did not count towards the cap but Sony DLC would count. That could influence you to buy and XBOX over a PS3.

I think it is through exceptions to their cap, via partnerships, that Comcast and other ISPs see as their way towards Access Tiering.