Great article Josh! One thing though. You linked Arcane Annihilator wrong. It links to an Outland mob instead of the Cataclysm boss ability. Oh and you gotta love Kill Shot :)

I'm alone on interrupting arcanotron in my raid. Whatever I miss, is healed. I've tried using grounding totem, but didn't see it work. Maybe it has to hit someone in your group, or it's a range issue.

I've also tried using my wolves' bash. It works sometimes but not always. Perhaps they are not hit capped. It's a 45 second cooldown, so only one interrupt anyway...

When you say you stay on after the shield, do you stop dps entirely?

"
When you say you stay on after the shield, do you stop dps entirely?"

From what I read in the article, it seems it's magic-dispellable, so I assume he purges it then can continue to dps and interrupt as normal :)

When I'm on the mob after its shield goes up, I don't dps. I just interrupt and purge if someone's pet hits it or something. Grounding totem is a hit or miss for me as well, but it helps when I'm the only one interrupting. Our DK tank has "too much going on" to simply hit Mind Freeze every other cast...even when he's tanking the shielded add. Doh.

Aye Grounding Totem is great for Arcanotron, but to be able to soak the damage you need the target to be a) in your party and b) in range of your totem.
I've always asked my raid leader to put me in the healer group, because they will almost always be near Arcanotron so they can step in his arcane puddle and so always in totem range.
After checking the logs, I saw that my totem managed to soak more than 60% of the spells that were uninterrupted.
Definitely a huge help.