A friend recommended 0AD to me three says ago. I've been dipping into it.
I'm pretty impressed. I speak as a former senior dev on Battle For Wesnoth, so I have a better idea than most what's required to produce a game like this. Some of you might recognize me for...other things.
Well done, everybody. I partiicularly like the attention to historical detail; I can recognize authenticity in the costumes and architecture. This kind of collaboration - attracting more talent than any single proprietary shop can afford to hire - is one of the strengths of open source. I'm expecting great things of the eventual 1.0 version.