The even freer commercial they made for it! To promote their new offer of a free DS with subscription to a whole bunch of stuff, Comcast hired John Kricfalusi to make a promotional animation. It's quite a bit better than pretty much any cable company commercial we've ever seen, and definitely a lot better than any Flash ad we've seen on a website. Animation this brilliantly weird should not be buried in Comcast's website.
Kricfalusi is best known as the creator and occasional voice of Ren & Stimpy
and the founder of Spümcø International. You can see some sketches for the ad on his blog, as well as lots and lots of animation nerdery.
Oh, and also, if you need phone, internet, and cable TV, you should think about signing up with Comcast right now and getting a free DS Lite out of it.