I’ve launched yet another half-complete web application relating to baseball sabermetrics! ML Splits is a database of minor league baseball players (batters only for now) that shows their “splits” (performance against LHP and RHP) as well as park effects and major league equivalencies. The data is taken from Jeff Sackmann’s old minorleaguesplits.com site where he made the CSVs available for import as open source.
I leaned on jQuery for front-end display purposes, as I’m getting more and more comfortable with using it for front-facing web applications. Mostly just dynamic div tagging and toggle() to keep the screen clear of distractions and make it easy to see what stats are really important. Wrote the entire thing in PHP 5.3.x, MySQL 5, CodeIgniter 2.0, and jQuery.
EDIT: Pitchers are up as of April 4th.