I also would like to bring to your attention the database at Sunray's virtual library.
http://www.freewebs.com/dominions2/
It's quite handy how the units are organized by nation.
I use both databases, but the one I hit first when facing a nation I haven't fought before is Sunray's. Edi's is good as well, containing (lots more) different info in a different format, but takes several times as long to load, and is aimed a bit towards modders and mapmakers, etc.