Oh, and seriously DPSers, set your tank as focus and display focus target if you have a unit frames mod that supports it, or at a bare minimum assist your tank. I understand there are AOE abilities, but there's no reason you should be single targeting a mob that no one else is.

As a DPSer (Fury Warrior) I will sometimes break that rule if there's a remote caster that no one can draw to the tank and the tanks can't aggro himself. I'd rather beat on (And if necessary get killed by) a caster who is targeting the healer because the tank is unable to generate threat on an out of range caster.

And yes, the preferred method is to get them to focus on the tank, but when that can't be dome IMO a DPSer should draw that threat away from the healer and onto himself. A dead DPSer is preferable to a dead healer.

I use this:
set [focus] to tank

macro: /assist [target=focus]

and put it on a convenient button.

I sometimes also did /assist [target=] as a way of pulling aggro off healer, usually only if the healer was a guildie or someone I knew. Sometime keeping the healer alive offsets a bad tank - or even just a mistake.

My dps in Wrath was crappy because I did this, but strangely the groups I was in rarely - and I mean rarely - wiped. When I tried other approaches, sometime I'd pull the mob "just beyond" the tank that hadn't been aggroed yet. At the end of wrath, I would just ignore the button as we rolled through, but at the beginning it was useful.

Good point Tristan. What I said assumes the tank is doing his job correctly.

I assume, Tristan, that you check to see who said far-off caster is targetting before you run in and start wailing on it. As a bear, I have no ranged silence and only recently got a real interrupt. So often, I'll let one caster stand off and nuke me while I tank another in melee, and throw Faerie Fire regularly on the ranged one. I can't count how many times a DPS has charged right on up to that mob who was safely nuking me, rip aggro, and make the healer have to heal TWO targets. :|

It's ok to go up to it and interrupt it so it comes to me. It's not ok to go up to it and start wailing on it as a second tank. As a fury warrior, you have an interrupt and should be dragging that mob to me so I can taunt it off you, not taking it upon yourself to tank it. I can't really think of any mobs who won't move even a little bit after being interrupted.