Salon Entertainment Review - http://www.salon.com/ent/movies/review/1999/07/02/southpark_uncut/index.html?CP=SAL&DN=110 Beneath the veneer of fake dicks and fart jokes, it's really a righteous paean to saying whatever the hell you want.
Allwatchers Review - South Park: Bigger, Longer, and Uncut - http://www.allwatchers.com/Topics/Info_5838.asp Analytical review of the plot, setting, theme, and structure of the Trey Parker and Matt Stone film, and links to similar movies.