Sept 23: Android "MLB at Bat" app is free today on Amazon.com
 

A little late in the season but if you're following the playoffs, it might be interesting:

Amazon.com: Appstore for Android

Note: MLB.TV subscription required in order to use some features (some reviewers apparently don't read the description).

Amazon has a free Android app every day. I've got lots of interesting & useful apps from them. One advantage to Android over iPhone is that there can be more than one storefront (of course, there are advantages to Apple's approach but I'm not one to live in a walled garden :p: ).