Comcast has just done the deed -- following a rumor on the matter, it's launching 305Mbps (down) / 65Mbps (up) Xfinity Platinum internet service in the highly populated Northeast division of the United States. For those who've been around a while, you may remember a time where one would weep upon finding out that Verizon's FiOS simply wasn't available at a desired location. Now, however, Comcast is doin