Searched and found nothing. If its a repost, post a link and i'll delete.
Anyways, my guild just did Valiona and Theralion and our resto shaman had his pvp spec on by accident. However, by this he noticed something very usefull.
He used grounding totem and noticed that it acturally is ''Soaking'' the Blackouts..
So we figured, why not test it. We wiped on purpose and tested it correctly, and we were right..
We had our shaman just place the Grounding totem every time the Blackout was about to happen, and if the blackout was to go on a member of the group the shaman was in, it would simply go to the grounding totem and no hugging needed.
Figured this would be quiet nice in 25man if you have 2+ shamans. Put them in difrent groups and make them use Grounding totem when the blackout is about to appear and you can relief your healers of some healing and dps some more..
Hopefully this will be of some use for you.
-Michael93