Next time, we shouldn't play on Epic.
Civ4 is different than Civ3 in that there aren't as many cities to work with, and builds generally take a bit longer (1-2 turn builds in multiple cities occur late in the game). I think you could save the game as a worldbuilder save, and edit the file to play as a normal, or quick game (it would require someone not in the demogame to change it, though). This is why I suggested 20 turn turnchats once or twice.
In fact, I think we should start playing 20 turns at a time. Epic is 600+ turns (I don't know the exact number offhand).
There's probably other reasons, too, like...
- The map has less than the standard 11+ civs that Civ3 demogames have had (minus daveshack's mistake - I think it was daveshack), so less possible role play. Take a look at Civ3 DG1 and some of DG2. (Pangaeas are the best for roleplay - more civs to meet) We were on continents then, and there was lots of action. Our continent is nothing more than a sleepy jungle!
- Our isolated position in the world. REALLY isolated - we were lucky enough to have 1 war. Plus, no religion
on the entire continent! 
really kills roleplay - and gameplay, too!
- Larger maps late in the game really eat up memory, and a lot of people's computers can't handle it very well. Thus,
screenshots are essential.