I am sure this is old news but I just went to Amazon.com and saw this:
Dear Customers,
Today, we're excited to announce that Prime Instant Video is available on iPad—just install the Amazon Instant Video app. Amazon Prime members can now get unlimited streaming of thousands of instant videos on iPad, Kindle Fire, PlayStation 3, Xbox 360, Roku, and hundreds more TVs and Blu-ray players.
Dear Customers,
Today, we're excited to announce that Prime Instant Video is available on iPad—just install the Amazon Instant Video app. Amazon Prime members can now get unlimited streaming of thousands of instant videos on iPad, Kindle Fire, PlayStation 3, Xbox 360, Roku, and hundreds more TVs and Blu-ray players.