This technically is not an exploit but it is a trick that my guild has been using for a while now each time we fight the Reliquary of Souls in Black Temple. Currently we are done with all content and are just farming, waiting for Sunwell.
For those of you having trouble with RoS though, this will make the third phase of the fight a joke.
1) Have all of your healers and ranged stack on top of one another 30 yards away from the raid
2) Have one of your groups consist entirely of Warlocks and Shadow Priests (either 3 Warlocks and 2 SP or 4/1)
3) Have all of your melee stand on top of one another while DPSing the boss
4) Have all of your Shamans (or as many as you can) in a group with at least 1 Holy Priest
Here's the trick. During phase three of the fight, the entire raid has a debuff which deals increasing amounts of damage to everyone over time. The damage starts at 130 and increases by 130 every 3 seconds. Additionally, however, this debuff increases damage and healing done by your raid in increasing amounts.
If you followed the steps I laid out above, simply do the following and phase 3 of this fight will be a joke:
1) Have all of your shamans do absolutely nothing but spam Chain Heal (we call it Brain Heal) on the melee
2) Have the Priests in the Shaman group just spam Circle of Healing or Prayer of Healing on the party
3) Have the Shadow Priest / Warlock group go crazy on the DPS
The debuff scales damage and healing done up, as mentioned, as time goes by. However, it scales to such a degree that a group of Warlocks Draining Life partnered with the group healing from at least 1 Shadow Priest, makes them entirely self-sufficient to the point where they will need absolutely no heals. This then, frees your Shaman up to ONLY heal the melee and frees your Priests in the Shaman group to ONLY heal themselves and the Shaman.
What you'll find is that at least two of your groups will be dead when RoS dies but your Shadow Priest / Warlock Group and your Shaman / Priest Group will both be standing at full health.
Hope this helps someone.