If you are interested in Major League Baseball races from the past, do not go to this new website (described below) if you have some pressing deadlines — you will not be able to leave for awhile:

BaseballRace.com is the creation of . . . Christopher J. Falvey. It is an online application that allows you to view any Major League Baseball season, split by league or division (even wild card races), as an animated, date-by-date race between the various teams you choose.
It was designed to bring a historical season to live more so than mere standings or graphs. With BaseballRace.com, you can experience an entire season “live.”
The data goes back to 1901, and includes every game of every season up through yesterday (7/30/2006).

Unless you are a Phillies fan, go to September 20 of the 1964 National League season and watch what happens over the final two weeks of the season. Hat tip to Eric McErlain for the link.