The Northrend Beasts heroic video I made can be viewed here:
Thanks must go to my good friend Alviarin for dealing with divx hard mode after my ham-fisted editing and kindly hosting the video for me.
My UI is a little screwed up in the video - I was experimenting with having some of my character and target frames at the bottom of the screen, which worked out badly and I have since reverted.
The most useful thing to take from the video I guess if you were looking for tips is the positioning of Dreadscale in P2. You want to be near enough the Acidmaw tank that he can get to you if he gets the debuff, but far enough away that the cone attack and AoE don't hit the raid. After each cone attack you will have a few seconds to move the boss around so that you can burn off the debuff from your raid members, before you need to be on your guard for the cone attack again.