Given that AK's position vis-à-vis baseball is precisely the opposite of mine, and her love of data visualization is even more intense, I wouldn't be shocked if she buys an iPad just to have this app.
Pennant
John Gruber links to a fascinating new app for iPads: Pennant contains historical data on every MLB game played by every team from 1952 to 2010. Since I actively avoid opportunities to watch or think about baseball, this was of little interest to me at first; but the innovative and beautiful data presentation makes it almost worth $5 to me. Almost.
