So licker, in the "what other games you play" thread mentioned a fun little browser game called "The Reincarnation". I find it most similar to an old BBS game I used to play that was called Falcon's Eye (this is not the Nethack Falcon's Eye, see the homepage
here).
Basically, you select a mage of some color (white red blue green black; nothing like every other high-fantasy game) and start your little kingdom. It is basically a resource management game where you are trying to grow your kingdom. Like Falcon's Eye (and most BBS games like this) there is no map, and land and other resources are completely abstracted. Land is gotten by simply 'exploring' for it or attacking someone and taking theirs, spatial positioning doesn't really exist.
You also recruit units, summon units, research spells, build items, and of course there is a 'black market' where you can buy troops and items. There's a ton of all this stuff. There's even heroes (a little like Dominions commanders, and they can even be equipped with stuff). Focus is largely on recruiting units and composing armies, while kingdom management is in managing abstract resources (land, gold, population, research).
I thought it might be fun to have some of the Dominions players make mages and form a guild to work together. The server regarded as the one most used by newbies (a server called GUILD) is going to be resetting soon. Once resetted, everyone starts over; the games last for about 3 months, at the end of which there is an Armageddon and whoever survives is declared winner. The GUILD server is on the Armageddon countdown now.
If you want to jump into the Dominions guild, post here. You should probably make a mage on one (or more) of the servers (probably either GUILD or BETA) and get some practice before the reset.
http://www.the-reincarnation.com/