As I am conquering a civ (while communist), I rush build temples/granaries/cathedrals until the population gets down to one. Then let it grow back naturally. Sure it may take a little longer, but I don't have to worry about unhappy peeps for a while. And, if for some reason it looks like I'll lose the city, I simply sell of the improvement, and the computer gets a size 1 or 2 city.
Sometimes though I end up razing towns. If I get stopped in my tracks before conquering a whole civ, the cities closest to the new border get razed, terrain improvements get sacked, and I fall back out of the neutral zone I just created. That way there's less cultural pressure from nearby cities.
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