How much would you pay annually for "free" streaming of over 5000 movies and TV shows? $US79? If that sounds like a fair price to you for all-you-can-eat viewing, Amazon Prime's streaming service can be used from today in the US.
Alternatively, you can buy or rent titles if you don't want to fork out for an annual subscription - but bear in mind Prime also offers unlimited free two-day shipping (which was enough for me to sign up, before I even heard whispers of a streaming service.). [Amazon via Engadget]