The Year Babe Ruth Hit 104 Home Runs
I haven't read this book yet, but it sounds interesting. The author combed through endless baseball statistics and added in all the times The Babe flied out at a distance that would be a home run today in the same city's current ballpark (since they tend to have smaller outfields than in the 1920s). Take that, Barry Bonds, you cheater!
Link to the book at Amazon.