In short, Comcast now will filter content to block or hinder various torrent and P2P connections. Comcast is sending fake disconnect or reset signals to some of the programs to reduce connection success. It's Comcastic.

An AP reporter attempted to download, using file-sharing program BitTorrent, a copy of the King James Bible from two computers in the Philadelphia and San Francisco areas, both of which were connected to the Internet through Comcast cable modems.

In two out of three tries, the transfer was blocked. In the third, the transfer started only after a 10-minute delay. When we tried to upload files that were in demand by a wider number of BitTorrent users, those connections were also blocked.

Not all Comcast-connected computers appear to be affected, however. In a test with a third Comcast-connected computer in the Boston area, we were unable to test with the Bible, apparently due to an unrelated error. When we attempted to upload a more widely disseminated file, there was no evidence of blocking.

The Bible test was conducted with three other Internet connections. One was provided by Time Warner Inc.'s Time Warner Cable, and the other came from Cablevision Systems Corp. The third was the business-class connection to the AP's headquarters, provided by AT&T Inc. and Cogent Communications Group Inc.

No signs of interference with file-sharing were detected in those tests.

What would be funny is if some extremists take this as Comcast blocking access to the bible.

Yahoo News - AP tests Comcast filter blocking (and Bible blocking)