Amazon Video on Demand is a streaming and download service from online eseller Amazon.com. Formally known as Amazon Unbox, Amazon Video on Demand has up-to-date movies and TV shows available for download in SD and 720p HD.

You can watch files from your computer, or from Blu-ray players, Digital Media Receivers, and TVs that have the Amazon Video on Demand built in.

HomeTheaterReview.com has an article about a possible streaming service for Amazon Video on Demand.

For a history of Amazon Video on Demand, visit the Wikipedia page.

HDGuru.com has a list of devices compatible with Amazon Video on Demand.

Apple's iTunes is the most notable competitor, with similar pricing, video quality, and show/movie availabilty. Other services like VUDU offer higher resolutions, but have a much smaller TV show selection (movie selections are similar).