This is a great thread; I have been using a variation of this strategy for sometime. I, like Moonsing only play on maps of large or bigger, personally I like maps that I can have all 16 civs involved. A few areas where I differ though are this:
1. I never raise a city, instead let the governor control the attitudes, I have taken cities as large as 28 pop, they actually were bigger than this but I like to bombard large cities to soften up the resistance and as we all know that usually kills off a few citizens in the process, and not had them flip, by the time the governor has them firmly under control and the city growing again, the pop could be down to 4 or 6, there happy and starving to death.
Only once have I had a city flip by letting the governor govern the attitudes, I took the city from the Chinese, and found that it was a city full of Iroquois, which was a surprise on my part, I had not realized they were at war, the Iroquois had three cities surrounding it, it was basically a peninsula into the Iroquois Nation, which was why I wanted it in the first place, but I was not surprised when it flipped.
Once you have a large enemy city in your possession you can always make workers to reduce the size of it, and flood it with your workers to help prevent a flip, these have been discussed in other threads so I will not elaborate.
2. I never send my troops overseas unless I have to or I control the entire continent that I am on, that does not mean I do not go overseas, I just like my empire to be contiguous and easy to defend, exception, I will snag small islands in a heartbeat, great outposts, easy to defend, great for staging invasions later in the game and the AI rarely builds marines to even try and take these. Luxuries are nice but not necessary, temples, cathedrals and coliseums all work very well and you need them anyway. I am not saying they are not important; it is just not necessary to have far flung empires that are hard to defend for the sake of spices, when one can dominate your neighbors. I do use Moonsings strategy for strategic resources though.
Another note to go with this, war weariness seems to lessen when you are fighting a foe that has been a nemesis for centuries, even if you are the one to declare war, has anyone else noted this or is it my imagination?
3. On Point 5, Moonsing is correct; the AIs buddies have probably joined the fray, but probably not as a MPP, just an alliance. If you can make peace with the first person you went to war with, you can then concentrate on the others, this has two benefits: you made peace, which gives you happy citizens, two; they declared war on you, not the other way around, so your citizens war weariness is greater, if you notice war weariness on the rise try making peace with one of the AIs if multiple are involved, if you can make peace with one your citizens will give you more time to conduct military maneuvers on the others. Domination is the name of the game.
4. Mr. Biggboy is correct; Post 4, Universal Suffrage and Police Stations do help.
5. Press Ctrl-Alt-Shift-F12-Esc-Tab-PgDn-Home-Break to unlock a secret Civfanatics Website!! This does not work, you forgot to press F6 also.
6. Lawrence is correct on the 4th Commandment, always keep 4 or 5 Cavalry or Armour in reserve to kick out invaders; this seems to be a huge factor on the war weariness chart for democracies.