The spell damage hit cap is 3% in pvp anything over that is a waste. http://www.wowwiki.com/Spell_hit
Unfortunately I can't view that page from China anymore. It's been block for probably more than a year now. :thumbdown:

Thanks so much for the replies guys. I checked my equipment and I have 40 hit rating, which gives more than 3% spell hit. I've retalented due to this information, so I've moved points from Elemental Precision into Unrelenting storm. I actually lost matches before due to running out of mana, so I hope this can help a little bit.

I also have the essential spell penetration enchant and i'm getting the rings. So I don't see any reason to gem for penetration. I didn't realize it was a 1 pen point to overcome 1 point of resist, so I really appreciate the clarification!

Also I would personally love to see some people trying to stack spell haste ...
I've got around 22% crit on all my shamans now, and i'm still having mana issues on DPS heavy fights where the opponents just won't let up. I won't trade crit for haste until I stop losing matches due to mana issues.

Tanked to 1680 from 1731 last night. A few matches we lost from impatience. Ugh, my partner and I LOSE 5v3 because I blow people up in bad places so we're running around like headless chickens trying to stop res's. He'll get caught up by a rogue or some shit and die then it's game over for me. One match where we held our cool and let them res kills that were in bad positions lasted freaking 1 hour and 20 minutes. Argh, res'ing is a nightmare for my partner and me.

edit: in my partner's defense the rogue that killed him had duel warglaives.