On the left of the site you should see a blue "play" button. Click that and the "On Air" light should turn red and the audio should begin to play live on your computer. If you don't see the play button, it may be that you need to get a more recent version of Adobe Flash Player, which you can download free here.
Sure, although our main method for broadcasting is through Flash, we also publish an MP3 format stream at http://174.37.194.139:8188/listen.pls which you can listen to in your choice of player.