This is a spot on top of the bone tusks that are in front of the door to drek. You can jump up on the thing next to them then jump onto them, leaving a perfect ranged attack spot. I made a video showing how to do it and posted it on youtube. EDIT: THIS IS POSSIBLE AS OF 2.4.2, VIDEO WAS FILMED 7/6/08
Video Link: [ame="http://www.youtube.com/watch?v=BdMm8uMryUA"]YouTube - WoW- AV horde ranged attack spot.[/ame]