Unscripted shows are a staple of the TV landscape. But no reality series has ever packed as provocative a punch as public television's documentary showcase P.O.V., which is celebrating its 20th anniversary this summer. Its 1991 presentation of Tongues Untied, a groundbreaking film about gay life in the black community, was condemned on the Senate floor and stations that carried the show received bomb threats. Farmingville, a film about the murder of two undocumented Mexican day laborers in a Long Island town, aired just after President Bush proposed his guest-worker program in 2004 and helped stir the recent immigration debate. The series has also brought the work of filmmaking mavericks Michael Moore and the
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