I just remembered another item which isn't very useful for raid DPS, but can be helpful elsewhere. I quit WoW shortly after Dire Maul was released, but when I came back, I had a few of these which I used when having trouble in level 70 instances:
[Thornling Seed]
They're kind of hard to use since they have a long cooldown, don't activate immediately, and pretty much die in 1 second when they draw attention... but if you dump it in front of healers or mages, it gives you an extra few seconds to react to any bad aggro/sheep breaks etc, or it can soak a few hits from trash on multi pulls, that kind of thing.