Stop posting press release posts.
Here is some non-Comcastic information - http://en.wikipedia.org/wiki/Domain_Name_System_Security_Extensions
Chris what is your non-biased take on Comcast forging TCP reset packets and terrible quality HD?
I also should mention that reading Wikipedia isn't the most reliable source, although that one is fairly good. I might suggest looking at the following if you don't care for Comcast's write up:
or the RFCs: