I'm currently (again) into OGame. OGame.co.uk, OGame.nl, OGame.be, it all works. Even Czech and French versions are out already. Next to that, I've played a lot Kings of Chaos.
A mate and myself where once thinking of putting a game like that together. It's a modern warfare, iraqi based wargame called Operation Takedown. We've put together a large flowchart but never really came around to making it.