Nearly a year later than originally planned, Comcast today launched a test version of its data usage meter for its Internet subscribers. The gauge, currently found only in Portland, Oregon, gives cable modem users a rough benchmark for the amount of data transferred in a given month as well as their use history. It should theoretically be more reliable than computer- or router-based trackers as it checks all Internet use, including consoles, phones and other devices that aren't always covered.