There is a vegan cheese, Follow Your Heart, that melts and I think is an okay substitute for occasional use (I tried it on pizza--had to put it under the broiler for a minute to melt the cheese--and I made quesadillas). The funny thing is that now that I know it's out there, I have absolutely no craving for cheese.
On that great website,
http://www.vsh.org/videos.htm, if you go to January of 2003, you'll find a lecture by T. Colin Campbell about the China Study--it'd be a great overview before reading the book. Dr McDougall also has some on April 2006, including Truth or Dairy.
I really struggled with giving up cheese. It was so easy to become a vegetarian, since I never liked meat. but I really liked cheese. For years I read about the health dangers of milk and the horrible factory farming, but I just couldn't give it up. Over the years I cut out most dairy (except for some with cooking), and tried to only eat it when I was outside of the house and it was harder to find all-plant meals. Well, since I did have to have cheese for DH, I'd eventually add a little to my taco, then a little to something else, and soon it was every day. I never thought I'd be totally dairy and egg free, since there were a few family favorites I thought I couldn't find any substitutes for. But when I made the decision that I wasn't going to eat dairy or eggs, somehow it was extremely easy. That was two months ago, and I'm still thinking that it was way too easy, and wondering why it took so long for me to do it! That same day I made the decision, substitutes for those family favorites (one used butter, and the other milk--and previous substitutions I'd tried didn't work), the answer (from my good friend, Mr Coconut) popped into my head and turned out to work great--no, it's not McDougall, but those are things I only make a couple times a year. It's really true that our tastes buds change over a relatively short amount of time.
The thing that finally did it for me was from "Skinny B*tch," which has been mentioned here before. Their factory farming stories were horrendous, and they really made it clear that these animals shouldn't have to suffer just so we can have a few moments of pleasure. I think that book, combined with the health part of The China Study (especially when you start to see casein as carcinogenic), is a great combo. There are a lot of factory farming videos online now--those are worth more than a thousand words.
Also, like mollyfisher, I thought about those mama cows. I'll never forget the screaming I heard from my sister's horse when her baby horse was taken away--it was horrific. I wasn't even a mom then--if it was now, I'd surely cry. As you probably know, the cows are artificially inseminated and kept pregnant for years so that they'll continue to produce milk--they're really being milked to death, and it's a horribe life and a slow death. And if you've ever nursed a baby, you know how important a "good latch" is, and how painful it is when it isn't--these cows have those metal things clamped on, they bleed and get infections, and it must be horribly painful. I didn't want to be a part of that any more, and that's what I think of when I see dairy products.
You've gotten a lot of good suggestions here, so hopefully something that someone said will click! It may not happen all at once, but eventually it will.