Are you not exactly sure what is going on with the Dark Portal opening, what it means, why, and what you can get from it?

WoW Insider lay it out for you - now go get that tabard!

Have you checked out the ongoing BC World Event yet? I've heard things are happening all over Azeroth. but so far the big draw is right down where Blizzard said it wouldn't be, in the Blasted Lands. Down there at the Dark Portal, there's a questgiver who gives you a really, really simple quest-- all you have to do is take out 6 of the felguards coming out of the portal, and the reward is a neat "limited edition" Tabard of the Protector-- it's black, which is cool, but it's also got a fun little proc that makes you flex and give off the priest AOE animation. Not bad for just a few minutes' work.