Quote Originally Posted by Shade
Totem of wrath stacks 5x (so +15% crit and +15% hit, on top of the 11% crit from talents, 5% dps from lightning overload, and 5% damage from concussion)
Healing stream stacks 5x (pretty nice hot, it looks like... but you'll probably use 3x, and use 1x mana spring and 1x poison cleansing)
Wrath of air does not stack (+121 spelldamage)
Grounding "stacks", sort of
5x magma or firenova is pretty good AOE dps
5x searing sounds pretty good, but I haven't seen it used in Xbox's vids
None of the earth totems stack, but staggered tremors in a castsequence macro are basically fear immunity
Staggered bloodlusts for perma-haste, basically

That's pretty much it, I think.
If you play Draenai shamis then you get +1% spell hit per caster accompanying you (racial) So I think in a group of 5 Shamis each will benefit from a further 4% +spell hit, that's 19% +spell hit with the 5 totems, pretty decent, which means you can totally ignore +hit on items and load up on +crit and spell damage. There's also more +hit talents worth taking, pretty much guarantees no resists.

26% crit from talents and totems alone, meaning 40-50% crit in decent gear would be doable (if you include the crit that intellect gives etc, this should be easy)

Meaning you'd be critting most of the time, meaning with the Elemental Focus talent, most of the time your spells will cost 60% less mana, very nice