Comcast (NASDAQ: CMCSA) is seeing Google Fiber's (NASDAQ: GOOG) 1 Gbps broadband service and raising it. The cable conglomerate announced Thursday that it will offer symmetrical 2 Gbps service to 1.5 million customers in Atlanta starting in May, with eventual plans to to extend the service to 18 million residences by the end of this year. Atlanta is a natural beachhead for the service, with AT&T (NYSE: T) and Google already announcing fiber plans for that market. FierceTelecom has a complete look at Comcast's announcement here.