Topic: Sins of a Solar Empire
Got this 2 days ago, can't stop playing it. Very well made mixture of real-time strategy and 4X.
The best thing about this game is how well it's designed - everything works exactly as you expect it, and the interface is fantastic.
There's no singleplayer campaign, only a ''skirmish''-option, it's designed for multiplayer.
So, try it out, it's very complex and a bit hard to get into, but don't give up! It's worth it, I think.