Amazon has finally confirmed what was Hollywood’s worst kept secret, that its Amazon Prime customers will be able to get some online video for free, just like the DVD rental customers of Netflix can get online video for free. To us this looks like an early experiment, and Amazon is thought to have about 2 million Prime members worldwide, bringing in around $79 a year, so the program has around $158 million in total. This, is a low number compared to the 20 million that are signed up to one service or other at Netflix, each paying at least $7.99 a month, so around $96 a year, making that around a $2 billion wad of cash ‘ it’s hard to…