I think last year you could stream the games from CBS's website. Their website advertises that they have a March Madness app for Apple that you can use to stream the games. I searched the Google Play Store and see a Turner Sports march Madness App
Just start typing in "NCAA" and it'll fill in the rest. There's a free NCAA March Madness app that will let you follow via gamecast, audio only, or streaming the game. It's damn awesome.