IF I had to pick only one of the choices, then I'm going to figure keeping up with news and current events is not something I can do!!!
If I had to choose from the above, I would pick books. My love of listening to audio books has taken a serious toll on some of the TV series that I do enjoy (just not more than books). I love the internet -- but again, not more than books! Radio is something I only tune to if I'm in my car (thank you, satellite radio), but more often than not, I still pick an audio book when I'm driving.
What about you fellow (what's the female version here?!?!) book lovers? If you could only have one of those choices, what do you think it would be?