It's not officially supported on the Iconia A500, but I got it to work today by installing ICS (Android 4.0) and going through the browser to mlb.com. Use the "request desktop site" option from the browser menu. Then login to mlb.com there, not mlb.tv as it will have issues in that dialog box asking for a password. After logging in to mlb.com, you can click the TV screen icon on the scoreboard for any game! Woo hoo!
