Star Trek Online. While you can't look (or click) on them now, it's quite telling that Cardassian and Romulan faction symbols are there for the looking. Cryptic has been pretty open with the fact that they plan to add new factions in the future, but the upfront listing of them causes us to wonder what the schedule is for the launch of faction number three.
We really love the approach to this faction page, too. Why? Selecting a faction gives you the perspective of said faction, but from each side. That is to say, you get a Klingon's point of view of their own Empire, as well as the Federation. It's a nice touch of Trek that shows the men and women at Cryptic are keen to stick to the spirit of the series, even when outside of their own game.