Moderation is indeed the key. This trans-fat issue is no doubt the current big health trend. It's a good one: personally I've been aware of trans fat for several years now--well before it became front-page news--and have made an effort to limit or outright avoid it where practical. But you gotta wonder if their being phased out will make people lose sight of overall good dietary practices. Trans fat or no, moderation in all fats and oils is still the way to go. Also (and I'm not entirely clear on this) I've read that the high temperatures used in the deep-frying you see with fast food tend to "denature" oil somewhat, making the oil more unhealthful than it otherwise would have been. Which basically means it's still a good idea to moderate the fried foods.
I'm all for eating healthy and all but we need to address the true cause of the obesity epidemice in this country, LACK OF EXCERSIZE! The lack of physical activity in adults and especially kids today is the major reasson why Americans are so fat. The fact that many schools have all but eliminated physical education and have legislated recess to the point where kids can no longer run and play any type of contact sport any more is the major cause, not vending machines, etc. When we all decide to stop watching so much tv and tear ourselves away from our pcs and video games (I'm as guilty as anyone), we will all be better off for it.