In the 3.2 Patch:
Wind Shock: Has been renamed Wind Shear and no longer shares a cooldown with Flame, Frost or Earth Shock.
What this means is we can rotate it into our Shamans spells without thinking about it for easy interrupts. It's off the GCD, and does no damage.

Put Wind Shear on:
Shaman #1 - Flame Shock
Shaman #2 - Lightning Bolt
Shaman #3 - Chain Lightning
Etc.
And... you can always leave it off on the main character to intentionally interrupt if you want