It's really, really sad to see so many of these guides coming out with what is essentially advice on "How to be a Human Being". Sadder still is the fact that people still, in fact, obviously need them.
So there you go. World of Warcraft, still not any more time consuming (and decidedly less anti-social) than watching TV. I have to say that I personally do more "nerd stuff" than TV watching, and the TV I do watch tends to be background noise.
I have to admit I live iTunes, though I work next to someone who is absolutely convinced it's a massive resource hog and therefore Teh Devil. Still a good list, however.