Haven't seen this in the forums yet and I'm not sure if this counts as an exploit but if you're doing progression attempts like my guild, for example Sarth3D 10man and you only have 1 shaman. Instead of waiting 10 minutes per attempt for the bloodlust cooldown to reset, you can get the shaman to:
1) Port/Astral Recall
2) Queue for a skirmish (2v2,3v3,5v5)
3) Get summoned back
This whole process takes 2 minutes and saves us like 7 minutes in between attempts which pretty much means we are getting double the attempts we would be getting without this 'exploit'. Skirmishes reset all your cooldowns.
*NOTE* Downside of this would be you lose your flask so if you're using this method be sure to use elixirs rather than a flask.