my group setup (havent done heroics yet, hoping to gear up first) is pally tank, 3 shaman dps, holy priest heal.

Pros: Massive single target dps, respectable aoe (3 fire totems + consecrate), group heals, lots of buffs (blessings, fort, shadow protection, and 3x totems) and great aoe threat (i.e. healer wont' pull aggro ever)
Cons: no CC. unless the pull has undeads.