Bill Simmons, ESPN's Sports Guy, recently listed what he considers to be the greatest examples of sports writing ever. C. Max Magee of The Millions then traced all of the articles Simmons cited. A number of them are available online, and for those that aren't, Magee tells you where you can find them.
Also, if you're a fan of sports writing, don't forget about the Best American Sports Writing series. The 2008 edition was published earlier this month.