Granted, speedskating is a winter sport, so you won't see it in London this summer. But American speedskater Bonnie Blair is worth mentioning here because she is one of the best speedskaters of all time, as well as one of the most decorated Olympic athletes of all time.
After competing in four Olympics, Blair has won five gold medals and one bronze medal. Not only that, but in 1992, Sports Illustrated voted her "Sportsman of the Year," and in 1994, The Associated Press selected her as the female athlete of the year. She was the most decorated American winter Olympian until Apolo Ohno knocked her off the top spot (he currently has two gold medals, two silver, and four bronze).