Here's a list of repeat World Series champions through 2009:
1. Chicago Cubs, 1907-08
2. Philadelphia Athletics, 1910-11
3. Boston Red Sox, 1915-16
4. New York Giants, 1921-22
5. New York Yankees, 1927-28
6. Philadelphia Athletics, 1929-30
7. New York Yankees, 1936-39 (won four in a row)
8. New York Yankees, 1949-53 (won five in a row)
9. New York Yankees, 1961-62
10. Oakland A's, 1972-74 (won three in a row)
11. Cincinnati Reds, 1975-76
12. New York Yankees, 1977-78
13. Toronto Blue Jays 1992-93
14. New York Yankees 1998-2000 (three in a row)
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The Houston Rockets
The Miami Heat
The Detroit Pistons
The Chicago Bulls
The Boston Celtics
6 teams have won back to back championships.