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New York Times, By CLIVE THOMPSON, November 21, 2008

THE "NAPOLEON DYNAMITE" problem is driving Len Bertoni crazy. Bertoni is a 51-year-old "semiretired" computer scientist who lives an hour outside Pittsburgh. In the spring of 2007, his sister-in-law e-mailed him an intriguing bit of news: Netflix, the Web-based DVD-rental company, was holding a contest to try to improve Cinematch, its "recommendation engine." The prize: $1 million.

Bertoni says it�s partly because of "Napoleon Dynamite," an indie comedy from 2004 that achieved cult status and went on to become extremely popular on Netflix. It is, Bertoni and others have discovered, maddeningly hard to determine how much people will like it. When Bertoni runs his algorithms on regular hits like "Lethal Weapon" or "Miss Congeniality" and tries to predict how any given Netflix user will rate them, he�s usually within eight-tenths of a star. But with films like "Napoleon Dynamite," he�s off by an average of 1.2 stars.

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