This gets you to the same place seen in Dankone's guide, however it uses only shadowstep to get there, no editing involved.
First off, be a rogue and be able to shadowstep. Make your way down the dead scar until you reach the invisible wall. Target a Scourge mob on the other side of the wall and shadowstep to him.
Get to the next invisible wall and shadowstep to one of the scourge mobs in the water.
Thats it. You're now past the walls and hangin with Brutallus =)
If you climb up the stairs to the top, the wall between you and Brutallus has no impact and you can jump through it to make it to the room with the whole in the side of the wall.
Thats all I've found to be interesting there since I dont have rocket boots or a parachute cloak... or basic knowledge of changing a campfire into a portal to another world =/. Hope you guys find some more in that area. Might also be a way to get past some other walls with mobs behind them.