I recently purchased a Roku. Amazon sent me this email reminding me that I could use Instant Video on my new device and linked to some setup instructions. Besides being useful, it will also help instant video get more usage. This is product integration (amazon store, instant video) at a level rarely seen by large companies. Bravo. 

An Amazon Prime Instant Video email headed “Roku Video Setup”, thanking the reader for their Roku purchase and offering a “Learn more” button to enable Amazon Instant Video on it.