Gameday Audio is in free preview mode right now (April 10, 2009).
You need to have flash player 10 for the Gameday Audio to work. The player is in flash.
You can get free Gameday Audio from Holliday Inn even if your not stay at one of thier hotels.
Just sign up for Gameday Audio through thier page. You will need to go through thier page everytime you want to listen or you wont be able to listen if you go through the main MLB.com site first.