Still playing 0 A.D. and it is fun. I always loose but it is fun nontheless.
Haven't decided yet which is my favorite civilization, but the Romans are a good candidate.
I read a website which gives playing hints.
I can really recommend 0 A.D.
I also replayed Battle for Wesnoth. Too much text thrown at the player for my taste. But if you don't mind that, you get a really good tactics and strategy game. To suceed in this game you have to think a bit and apply lessons learned.