As promised, MLB At Bat 2009 ($9.99, iTunes link) is now serving live video of 1-2 games a day in addition to offering audio to all MLB games. The video can be streamed over 3G as well as WiFi.

I’ve been testing the video the past two days, and because of the bandwidth it requires, I have a feeling many will find it unusable in mobile situations. Anything but a strong, constant 3G signal and the video is pretty unwatchable–unless you don’t mind severe gaps every 1-2 minutes. And we all know how reliable AT&T’s 3G network is. Over my solid WiFi connection at home, it works like a charm. So, if you’re working on the car outside and want to have the game on in the background, it’s a great app. Maybe not so much sitting at your desk at work.

The games are subject to blackout, so the app will first request to discover the iPhone’s location using GPS before it will let you watch the game.

The video’s quality is not that great–it’s heavily pixelated. But it’s good enough to read the score at the top of the screen. It’s no replacement for watching the game on a TV, but it’s better than no video at all.

MLB At Bat 2009 is a $9.99 download in the iTunes App Store.