Comcast and MGM are launching Impact, the first video on-demand channel featuring only action programming. Need flicks and TV shows like Terminator, James Bond or Robocop a button press away at all times? Consider it done, as Impact will have 25-30 titles available every month from MGM's deep -- apparently deep enough satisfy this channel and MGM HD -- with "many" in HD. MGM is apparently in talks with other carriers about the adding the network, but it should roll out to Comcast systems throughout this week. According to Variety, the channel will also go online next year, allowing subscribers to stream movies to their PCs at no extra cost.