Similar to the free MP3 credits offered by Amazon earlier this month, they're now offering a free movie rental. The $4 movie credit is good toward any movie purchase or rental, including new releases like The Hangover and Harry Potter & The Half-Blood Price. To get your free rental, head over to Amazon's video on-demand page and enter the promotional code provided. Then choose the movie or TV show you want to watch and click the "buy" or "rent" button.
You'll have to create a free Amazon account if you don't already have one, and the offer is only good until Sunday, January 3, so hurry up and take advantage of this free offer!