MLB Gameday Audio and MLB AtBat are two different things. Gameday Audio lets you listen to any regular game (including postseason) over the internet, and you can choose which feed (home, away) you want to listen to. All games are archived so you can go back and listen later, though I don't know how long they keep them available for. This is the ONLY way to listen to games online. It also features expanded Gameday graphics and information. Gameday Audio is $20 per year. AtBat is an app for mobile devices and costs $15. In addition to audio, you can get expanded news and video highlights from all around MLB. I've had both, and they're great deals. I travelled quite a bit this past year, so I don't know if I'll do AtBat again this year, but I'll definitely get Gameday Audio when it becomes available.