Unless you are a BitTorrent-loving downloading machine, Comcast’s broadband service is good enough. Today it got a little better and much faster. Comcast has doubled the speeds of its top tier high-speed Internet service to 16 Mbps. This is a free upgrade and the new tier is called BLAST, and will roll out on February 22 and it will be available for those of you who currently have 8 Mbps. This is available in the Bay Area only. Comcast has promised speeds of 100 Mbps using DOCSIS 3.0 technology over next two years.