1) Super Bowl XXI: Entertainment was a "Salute to Hollywood's 100th Anniversary" with drill teams and dancers from high schools in California.
2) Super Bowl XXV: New Kids on the Block.
3) Super Bowl XXXV: Britney Spears, Nelly, Aerosmith, Mary J. Blige, and NSYNC.
4) Super Bowl XLII: Tom Petty
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College Marching Bands were the halftime entertainment for the first three Super Bowls. In Super Bowl IV, played at Tulane Stadium in New Orleans, Carol Channing was the star of the halftime show whose theme was the Mardi Gras.
http://en.wikipedia.org/wiki/List_of_Super_Bowl_halftime_shows for the whole list of performers including the 2011!