I'm now at 750 AD. The Maya are gone, the Iroquois have one city (they had a settler when I took their last city; their new capital is far away so I made peace for now, there was some WW), The Aztecs have three (and falling). I'm going to start on the Americans very soon. My long-term dogpile has more or less petered out, I made peace myself with the Great-Library loving Inca, so I could leverage Gunpowder from them (only the Greeks are still fighting them). So far I have not interfered with the Greeks or Zulu (Shaka hasn't bothered leaving his island, despite having built the Great Lighthouse).
I have four turns to Mil. Trad. (the last 3-4 techs have been at a four-turn pace) then I need ToG and Magnetism, they should be four turns each too. I also detoured to Economics, and I should get Smiths about the same time as I reach the IA. I also built the Colossus and Leo's, and I have benefited from the ToA for a short while after I took it from the Maya. I captured SoZ and MoM in the Aztec capital (SoZ expired after making only one AC).
I'm debating now whether to gift the Greeks forwards since I'm not sure I can get their free tech from them without dastardly tricks (they do have a settler/hoplite trapped in my terrirory, and they're furious with me).
I'm also pondering now the switch to Communism. I'm going to need Sanitation to get the most out of my OCP, but the top priority in the IA has to be Steam. Industrialization will be nice, for a factory to build the SPHQ.
So I think it's going to be: Steam/Nat/Ind/Com/Med/San (maybe I'll go to RP before sanitation?). Then Corp., I guess.
I'll probably rush a lot of settlers/workers just before the switch; lots of my outlying OCP cities are already building courthouses or aquaducts, the core cities mostly have Courthouses/Markets/Libraries, and are building Banks.
When I get to 1000 AD, I'll post some pictures.