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I'm sure this will get the typical "gu bakc 2 wOw" response, but it really is one of those things that they've done that is nothing short of absolutely amazing:
With their battle.net system, you can add people to your friends list cross server. You can talk with them cross server, and you can even invite them to a group cross server. They recently took it a step further with their cross realm zoning (I don't expect this here anytime soon, if ever), where when you join a friends party it moves you to their realm. You can see, interact, and play with them as if you were on the very same server. Leave the group, and *poof* you're back on your home realm. Not on the same realm? No problem, because it doesn't matter anymore.
It even lets you talk to your friends when they aren't even playing the same game as you. None of SEs game are really set up for that, nor do they make many games that would even be able to utilize it, but it's something to consider for just how well things can be setup for communication between players.
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Know what else we need? A way invite friends/LS/FC members to our dungeon group if we are missing a member and someone you know can fill it. It's pure luck whether you find your friend's dungeon server and I think it'd be nice if we could directly invite them.