The FCC found Comcast was throttling peer-to-peer file downloads (see "FCC Rules against Comcast" and references therein). In this ruling, they've gotten a bit more .. formal with the Internet provider. From the article:
The ruling by the FCC does not include any fines against Comcast. But it requires the company to cease impeding peer-to-peer applications, to tell the FCC how the practice has been used, and to notify customers about other network management practices it adopts in the future.
The complaint against Comcast was filed by consumer groups who said the company had blocked file-sharing services, such as BitTorrent, that distribute TV shows and movies.
The case has become a flash point for a growing debate over a concept known as "network neutrality," which pits open-Internet advocates against some Internet service providers, who say they need to take reasonable steps to manage ever-growing traffic on their networks for the good of all users.
Baseline: "FCC Orders Comcast to Modify Network Management".