We've had the megahertz and megapixels races, now how about a megabits per second contest? A Comcast customer has posted a note from his latest bill online, showing a new Extreme 105 service that will puportedly be launching on June 1. You'll need to obtain an Arris WBM760 cable modem to make it work, while also ponying up $249 for installation and $200 each month thereafter, but such is the price for sailing in the mostly unexplored 105Mbps downstream and 10Mbps upstream currents. Guess that will have