The quest chain to obtain the key to Shattered Halls in Hellfire Citadel starts with a drop from [url=http://www.thottbot.com/?n=1058202]Smith Gorlunk[/url] at 67,36 in Shadowmoon Valley.  He's easy to one man as long as you can fly in to take him on.  Getting to him via foot requires taking down several elites I believe.  He drops the [item]Primed Key Mold[/item] which starts the quest chain.  The final part of the quest requires taking down a Fel Reaver!  It'd be fun if some of us could get together to do that when we're to that point in what appears to be a short chain.