Opengolf.com features an excellent radio broadcast of the event and can be listened to all over the world (many Americans submitted questions for the team to answer during lulls in play.)
If you are looking for an alternative to television, you'll get some stellar coverage here. For eight pounds I purchased the FM radio's sold at the course and had a joy listening to the crew yesterday while out on the Old Course. One highlight: a great chat between Tiger and Stevie about what shot to hit into a green. They never once talked over it. Miracles to happen.
Geoff