You rate films you've watched and get recommendations on new movies based on other people rates.
3 Answers
You can try TasteKid or Jinni.
EDIT: Lifehacker has just posted a top 5 movie recommendation services.
Filmaster.com has an open api. You can go directly to the main page by clicking here.
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1Can you explain how this helps? Don't forget we're talking about users of web applications here, not developers.– ChrisF ♦Commented Jan 16, 2012 at 15:01