@krys
The civpedia in vanilla C4 is a bunch of icons that are ordered alphabetically and give an icon name when you mouse over it. I think it's very annoying because only experienced players recognise icon before they see the accompanying name. Obviously an experienced player isnt very likely to use the civpedia. The few times I used it I found it very difficult to find what I need quickly. Warlords has the good old simple alphabetical list again.
Patch: the patch I referred to is good old 1.61 patch that you can download for free. I didnt had interneraccess last week so for me buying warlords was the only way to get that patch. So no reason to buy the addon.
PBEM's: I wont be playing one soon as I really dont have the time. Too much work, not enough play.
Maybe x-mas when I feel like it and I have a bit more free time.