One of the best baseball sites on the web is Retrosheet (www.retrosheet.org). They have play by play accounts and box scores of every major league game from 1954 – 2007 (excluding 1955). The data they’ve collected has allowed them to add lots of features. One of the best is data on how a batter or pitcher performed against his counterparts. At the click of a mouse, you can see who your favorite player wore out and who he couldn’t touch.