Hell hasnt quite frozen over, but it got a bit chilly today (Apr. 23) when Amazon announced that a big chunk of HBOs back catalog will be available for unlimited streaming to subscribers of the $99/year Amazon Prime program. HBO has been playing extremely hard to get online. The HBO GO app, now on many major streaming boxes such as Apple TV and Roku (and soon coming to Amazons Fire TV), provides unlimited access to HBO, but only to people who also have a cable subscription.