According to SAI, MLB.com's At Bat 2009 iPhone application(iTunes Link) is currently the no. 3 app in Apple's iPhone store, and is one of two $9.99 apps in the top 100. It is closing in on a $1 million in revenue on sales of 130,000 downloads at $10/each. Apple's 30% cut is over $300,000. Also, 220,000 copies of the free At Bat Lite have been installed on the iPod Touch and iPhone. Not too shabby.
