Movies
The film website will show a mix of recent and classic movies - including Master And Commander, Raising Arizona and Some Like It Hot - in addition to TV shows such as Heroes, 24 and Star Trek.
The season premieres of 30 Rock and Knight Rider will be available to watch on IMDB before their US TV broadcast.
The site's Col Needham said: "We're excited to offer our users a simple online experience to watch full-length movies and TV episodes for free. Our goal is to show our users every movie and TV show on the internet for free."
The service is currently only open to US browsers due to territorial licensing issues.
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