Criticker claims to be "the best Movie Recommendation Engine and Community on the Internet!" When asked if they would be trying for the NetflixPrize, their answer was "NO ! We won’t take part...if someone ever tries to submit our algorithm, it won’t do him and Netflix any good - because Netflix won’t be able to use it.
To get our algorithm they would need to buy Criticker, but it won’t be a 1 million [dollar] bargain."
Have you tried Criticker? If so, how does it compare to Netflix?