There are several good followers on Twittee that basically give play-by-play. D1baseball is the best website for baseball scores. Maybe they have an app?
The Hail State free app has live updates of home games. On the bottom right hand there is a more button, go there then click on scores. But as strat referenced, several good follows on twitter that update the game.
Twitter. Not kidding. That really is the best way to get a real time score update unless you're listening/watching. And Twitter runs ahead of the broadcasts.
If you follow MSU Baseball on twitter, they give real time updates that are good. Some of the others like Bonner and Carksadon(sp?) give their takes as well so you can get 2-3 perspectives on every play.