You can check out Geaux Zone for free. They will let you watch short highlight films. Living too far away to go to home games, Geaux Zone has been great for me. It has every sport there is, press conferences and coach's shows.
If a game is nationally televised then you won't get a live video feed. You can watch a video replay of every game though after the fact. Live audio is available for every game.
Live video is available if it is regionally televised and you live out of the region. ESPN3 is great also but I have a feeling they will start charging soon and it won't be cheap.