I've been playing EvE: Dust 514. First person shooter/mmo.
You play in the same sandbox world as the rest of the EvEverse only rather than piolting out in the far reaches of space you are the ground team for planets that are being explored. The coolest thing about it is that decisions and battle results on the ground directly influance politics and economics in both games. Not to mention your buddies up in space (EvE Online) can directly help you. If a player in EvE Online is in position within 100km of a district satelite above a planet with a ship loaded with weapons and ammo capable of firing at planets, the player can support his or her side of the Dust 514 battle if there is a battle currently taking place and a Dust 514 player has designated a target for the ship to fire upon.
You get all the perks of joing the same corps etc as the pc players, you can buy and trade with each other and you can chat between console/pc. Interesting story imo. It's free on the PS3 so might be worth checking out.