Wargaming.net, not content with cornering the free to play tank and war plane based free online games have just announced a third sea based version with battleships. Players of any of the three games will be able to trade resources between them, I assume this means you buy or win gold in one and you can spend it in any of them.

Actually I think this would be pretty cool, but only if I can be a submarine being sneaky and firing torpedos at hospital battle ships, while dodging depth charges from destroyers pinging the sea for my location.