In my opinion, Retrosheet is the most important baseball site on the web. And they’ve recently released their annual expansion. Now you can get box scores and play by play all the way back to 1957. In addition, the have some earlier years fro the 1900s. Just as important, they now have play by play for most of the missing year (1994-1998). The only season since 1957 that you can’t get play by play info for is 1999.
Stop by and you’ll find youself spending more time then you wanted just checking things out. It’s easy to do at Retrosheet.