Chimaeron (DEAR GOD IT BURNSES THE EYES!):
TankSpot: http://www.tankspot.com/showthread.php?72784-Chimaeron
10-man Friendly:
(Yes, I am well aware that nearly everyone is dead by the end of each video, and wheelchair circles aren't to blame. Just read the strat and see why.)
Strat:
~ When boss hits 20%, few things happen. Boss becomes untauntable, will not use massacre/poison bolts/double strike, takes 10% extra damage and ALL healing done is reduced by 99%. This is as simple as it gets as a burn phase, pop heroism, everyone including healers just nuke/kite the boss as much as you possibly can (priests can still shield stuff but it really isn't worth it). Everyone takes 2 hits to die thanks to bot buff still being active, so just nuke the boss down as hard as you can.