Amazon Instant Video has just been added to the Playstation 3... and to mark the occasion, Amazon offers a $2 credit on the rental of a movie from their streaming site.
Just follow this special link
and let Amazon know about your favorite movie. You do not need to use a PS3 to access Amazon Instant Video. Its available through many Blu-Ray players, Roku, and Kindle Fire.
The $2 credit will be automatically applied to your Amazon account, but it must be redeemed before midnight tonight.