This site has been working on a Civilization 4 wishlist for a while, and it sounds like there's not much more time to contribute. There's not as much activity going on as there could be, and I would like more activity to give me more to think about so I can come up with more ideas.
I kicked myself in the six for not picking up Civ3 before it ran out.
I'm looking forward to what Civ4 may have.
Anyhoo, just some random thoughts...
"My philosophy is 'you don't need me to tell you how to play -- I'll just provide some rules and ideas to use and get out of your way.'"
-- Monte Cook
"Min/Maxing and munchkinism aren't problems with the game: they're problems with the players."
-- excerpt from Guardians of Order's Role-Playing Game Manifesto