A sticky would help.
Some general balance thoughts:
Early Elven magic (especially Dark Elves, and Wood Elves' mass forestation) is far too strong. Most magic requires lots of techs, structures and an expensive wonder. Elves not so much.
Some buildings are too expensive or generally rarely worth building. Some examples:
Observatory. Possibly too expensive compared to university or bank.
Alchemist lab. Drop the unhealthiness and reduce cost. Its junk compared to Library or Elder Council.
Graveyard. Make it +2 health, +1 unhappy. Increase cost mildly.
Mastersmith is too expensive for its effect. Reduce cost. Meteoric iron isnt really worth the gold cost either.
It would be nice if all the temples/religions could be slightly differentiated. They're almost identical at the moment.
Bowyer is too expensive given that all it does is boost Longbowmen shooting range.
Recon/skirmish line is not worth building. Some new thinking is needed here. Either give them a really high withdraw chance, increase their strength, or give them a minor bombardment ability like Longbowmen (move in, bombard, move away - so they're actually for skirmishing with). Maybe they reduce the top unit in the stack by 10% strength, but can damage all the way up to 60-80%. Only problem with this is AI won't use that. Also would increase the utility of the bowyer, making these guys still useful late game.
Given that many of the races clearly aren't "done" yet, its hard to provide constructive race balance feedback.
I suppose that we could compare to say the Empire as a baseline. Any penalties that other races getting (no top level tech, limited magic, growth penalties etc) should be balanced with bonuses.
I would definitely say that Dark Elves are too strong; they get very minor penalties in exchange for *powerful* magic and Elven troops (bonus move, first strike).
Wood Elves are stronger than High Elves; basically, the sides are identical except that wood elves get to build in forests.
Clearly the leaders aren't balanced. Some leaders get 2-3 good powers, while others have just 1-2 fairly crappy ones. Ariel or Crom for eg are fairly sick. Leader traits also clearly aren't balanced.
It would help to know what aspects of the game are considered closest to "done", and so where balance comments would be most helpful.